fix(:connect): don't use freed memory (#38512)

Changing REUSE_MAX from 4 to 0 produces the following ASAN error:

=================================================================
==924403==ERROR: AddressSanitizer: heap-use-after-free on address 0x7d33333ed128 at pc 0x55f165a47a86 bp 0x7fff40e71690 sp 0x7fff40e71688
READ of size 1 at 0x7d33333ed128 thread T0
    #0 0x55f165a47a85 in socket_address_tcp_host_end **/src/nvim/event/socket.c:37:30
    #1 0x55f1667d6349 in channel_connect_event **/src/nvim/ui_client.c:296:17
    #2 0x55f165a35af6 in multiqueue_process_events **/src/nvim/event/multiqueue.c:159:7
    #3 0x55f165a308f6 in loop_poll_events **/src/nvim/event/loop.c:81:3
    #4 0x55f1667d3fbc in ui_client_run **/src/nvim/ui_client.c:172:5
    #5 0x55f165e1f2e1 in main **/src/nvim/main.c:367:5
    #6 0x7f23340bc6c0 in __libc_start_call_main /usr/src/debug/glibc/glibc/csu/../sysdeps/nptl/libc_start_call_main.h:59:16
    #7 0x7f23340bc7f8 in __libc_start_main /usr/src/debug/glibc/glibc/csu/../csu/libc-start.c:360:3
    #8 0x55f16521d044 in _start (**/build/bin/nvim+0xcb9044) (BuildId: 6c8517919bbcd317c6bb5675d1eb3f2c7c319e2c)

0x7d33333ed128 is located 40 bytes inside of 4096-byte region [0x7d33333ed100,0x7d33333ee100)
freed by thread T0 here:
    #0 0x55f16532547d in free.part.0 asan_malloc_linux.cpp.o
    #1 0x55f165fc2380 in xfree **/src/nvim/memory.c:159:3
    #2 0x55f165fc5b6d in free_block **/src/nvim/memory.c:786:5
    #3 0x55f165fc5c38 in arena_mem_free **/src/nvim/memory.c:798:5
    #4 0x55f166082dd2 in parse_msgpack **/src/nvim/msgpack_rpc/channel.c:258:7
    #5 0x55f166078ade in receive_msgpack **/src/nvim/msgpack_rpc/channel.c:217:5
    #6 0x55f165a4683b in read_event **/src/nvim/event/rstream.c:234:23
    #7 0x55f165a462d8 in invoke_read_cb **/src/nvim/event/rstream.c:287:3
    #8 0x55f165a42e11 in read_cb **/src/nvim/event/rstream.c:149:3
    #9 0x55f166bdc28b in uv__read **/.deps/build/src/libuv/src/unix/stream.c:1145:7
    #10 0x55f166bdba97 in uv__stream_io **/.deps/build/src/libuv/src/unix/stream.c:1208:5
    #11 0x55f166bca7fe in uv__io_cb **/.deps/build/src/libuv/src/unix/core.c:930:5
    #12 0x55f166be6251 in uv__io_poll **/.deps/build/src/libuv/src/unix/linux.c:1546:11
    #13 0x55f166bc9c57 in uv_run **/.deps/build/src/libuv/src/unix/core.c:460:5
    #14 0x55f165a30be7 in loop_uv_run **/src/nvim/event/loop.c:59:3
    #15 0x55f165a30864 in loop_poll_events **/src/nvim/event/loop.c:80:26
    #16 0x55f1667d3fbc in ui_client_run **/src/nvim/ui_client.c:172:5
    #17 0x55f165e1f2e1 in main **/src/nvim/main.c:367:5
    #18 0x7f23340bc6c0 in __libc_start_call_main /usr/src/debug/glibc/glibc/csu/../sysdeps/nptl/libc_start_call_main.h:59:16
    #19 0x7f23340bc7f8 in __libc_start_main /usr/src/debug/glibc/glibc/csu/../csu/libc-start.c:360:3
    #20 0x55f16521d044 in _start (**/build/bin/nvim+0xcb9044) (BuildId: 6c8517919bbcd317c6bb5675d1eb3f2c7c319e2c)

previously allocated by thread T0 here:
    #0 0x55f1653263e5 in malloc (**/build/bin/nvim+0xdc23e5) (BuildId: 6c8517919bbcd317c6bb5675d1eb3f2c7c319e2c)
    #1 0x55f165fc2054 in try_malloc **/src/nvim/memory.c:113:15
    #2 0x55f165fc22b4 in xmalloc **/src/nvim/memory.c:147:15
    #3 0x55f165fc4d5d in alloc_block **/src/nvim/memory.c:717:12
    #4 0x55f165fc4e09 in arena_alloc_block **/src/nvim/memory.c:724:20
    #5 0x55f165fc5113 in arena_alloc **/src/nvim/memory.c:746:5
    #6 0x55f166096d98 in api_parse_enter **/src/nvim/msgpack_rpc/unpacker.c:161:5
    #7 0x55f166aa290e in mpack_parse_tok **/src/mpack/object.c:56:29
    #8 0x55f166aa4fa9 in mpack_parse **/src/mpack/object.c:82:16
    #9 0x55f166099de9 in unpacker_advance **/src/nvim/msgpack_rpc/unpacker.c:343:12
    #10 0x55f1660825c9 in parse_msgpack **/src/nvim/msgpack_rpc/channel.c:248:10
    #11 0x55f166078ade in receive_msgpack **/src/nvim/msgpack_rpc/channel.c:217:5
    #12 0x55f165a4683b in read_event **/src/nvim/event/rstream.c:234:23
    #13 0x55f165a462d8 in invoke_read_cb **/src/nvim/event/rstream.c:287:3
    #14 0x55f165a42e11 in read_cb **/src/nvim/event/rstream.c:149:3
    #15 0x55f166bdc28b in uv__read **/.deps/build/src/libuv/src/unix/stream.c:1145:7
    #16 0x55f166bdba97 in uv__stream_io **/.deps/build/src/libuv/src/unix/stream.c:1208:5
    #17 0x55f166bca7fe in uv__io_cb **/.deps/build/src/libuv/src/unix/core.c:930:5
    #18 0x55f166be6251 in uv__io_poll **/.deps/build/src/libuv/src/unix/linux.c:1546:11
    #19 0x55f166bc9c57 in uv_run **/.deps/build/src/libuv/src/unix/core.c:460:5
    #20 0x55f165a30be7 in loop_uv_run **/src/nvim/event/loop.c:59:3
    #21 0x55f165a30864 in loop_poll_events **/src/nvim/event/loop.c:80:26
    #22 0x55f1667d3fbc in ui_client_run **/src/nvim/ui_client.c:172:5
    #23 0x55f165e1f2e1 in main **/src/nvim/main.c:367:5
    #24 0x7f23340bc6c0 in __libc_start_call_main /usr/src/debug/glibc/glibc/csu/../sysdeps/nptl/libc_start_call_main.h:59:16
    #25 0x7f23340bc7f8 in __libc_start_main /usr/src/debug/glibc/glibc/csu/../csu/libc-start.c:360:3
    #26 0x55f16521d044 in _start (**/build/bin/nvim+0xcb9044) (BuildId: 6c8517919bbcd317c6bb5675d1eb3f2c7c319e2c)

SUMMARY: AddressSanitizer: heap-use-after-free **/src/nvim/event/socket.c:37:30 in socket_address_tcp_host_end
Shadow bytes around the buggy address:
  0x7d33333ece80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x7d33333ecf00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x7d33333ecf80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x7d33333ed000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x7d33333ed080: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x7d33333ed100: fd fd fd fd fd[fd]fd fd fd fd fd fd fd fd fd fd
  0x7d33333ed180: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x7d33333ed200: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x7d33333ed280: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x7d33333ed300: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x7d33333ed380: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==924403==ABORTING

0 files changed, 0 insertions, 0 deletions