eval, ex_getln: Fix incompatible pointer types (#8792)

Fixes #8786

gcc (GCC) 8.1.1 20180531 warning:

[76/182] Building C object src/nvim/CMakeFiles/nvim.dir/ex_getln.c.o
../src/nvim/ex_getln.c: In function ‘ExpandUserDefined’:
../src/nvim/ex_getln.c:5071:34: warning: cast between incompatible function types from ‘char * (*)(const char * const,  const int,  const char_u * const* const,  const _Bool)’ {aka ‘char * (*)(const char * const,  const int,  const unsigned char * const* const,  const _Bool)’} to ‘void * (*)(char_u *, int,  char_u **, int)’ {aka ‘void * (*)(unsigned char *, int,  unsigned char **, int)’} [-Wcast-function-type]
   retstr = call_user_expand_func((user_expand_func_T)call_func_retstr, xp,

1 files changed, 6 insertions, 6 deletions

diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 3843245070..15b5c3eef3 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -1186,7 +1186,7 @@ int call_vim_function(
     const char_u *func,
     int argc,
     const char_u *const *const argv,
-    int safe,                       // use the sandbox
+    bool safe,                       // use the sandbox
     int str_arg_only,               // all arguments are strings
     typval_T *rettv
 )
@@ -1276,9 +1276,9 @@ varnumber_T call_func_retnr(char_u *func, int argc,
 ///
 /// @return [allocated] NULL when calling function fails, allocated string
 ///                     otherwise.
-char *call_func_retstr(const char *const func, const int argc,
-                       const char_u *const *const argv,
-                       const bool safe)
+char *call_func_retstr(const char *const func, int argc,
+                       const char_u *const *argv,
+                       bool safe)
   FUNC_ATTR_NONNULL_ARG(1) FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_MALLOC
 {
   typval_T rettv;
@@ -1302,8 +1302,8 @@ char *call_func_retstr(const char *const func, const int argc,
 ///
 /// @return [allocated] NULL when calling function fails or return tv is not a
 ///                     List, allocated List otherwise.
-void *call_func_retlist(char_u *func, int argc, const char_u *const *const argv,
-                        int safe)
+void *call_func_retlist(char_u *func, int argc, const char_u *const *argv,
+                        bool safe)
 {
   typval_T rettv;