unittests: Use Neovim memory allocation for vimconv_T

Not sure whether this is going to fix things though, but core dump does not 
contain Neovim functions in stack in this case.

1 files changed, 7 insertions, 4 deletions

diff --git a/test/unit/eval/typval_spec.lua b/test/unit/eval/typval_spec.lua
index e26e1c918f..53ef299fce 100644
--- a/test/unit/eval/typval_spec.lua
+++ b/test/unit/eval/typval_spec.lua
@@ -743,10 +743,13 @@ describe('typval.c', function()
         collectgarbage()
       end)
       itp('copies list correctly and converts items', function()
-        local vc = ffi.gc(ffi.new('vimconv_T[1]'), function(vc)
-          lib.convert_setup(vc, nil, nil)
-        end)
-        -- UTF-8 ↔ latin1 conversions need no iconv
+        local vc = ffi.gc(
+          ffi.cast('vimconv_T*', lib.xcalloc(1, ffi.sizeof('vimconv_T'))),
+          function(vc)
+            lib.convert_setup(vc, nil, nil)
+            lib.xfree(vc)
+          end)
+        -- UTF-8 ↔ latin1 conversions needs no iconv
         eq(OK, lib.convert_setup(vc, to_cstr('utf-8'), to_cstr('latin1')))
 
         local v = {{['«']='»'}, {'„'}, 1, '“', null_string, null_list, null_dict}