vim-patch:9.1.0341: Problem: a few memory leaks are found (#28382)

Problem:  a few memory leaks are found
          (LuMingYinDetect )
Solution: properly free the memory

Fixes the following problems:
- Memory leak in f_maplist()
  fixes: vim/vim#14486

- Memory leak in option.c
  fixes: vim/vim#14485

- Memory leak in f_resolve()
  fixes: vim/vim#14484

- Memory leak in f_autocmd_get()
  related: vim/vim#14474

- Memory leak in dict_extend_func()
  fixes: vim/vim#14477
  fixes: vim/vim#14238

closes: vim/vim#14517

vim/vim@29269a7

Co-authored-by: Christian Brabandt <cb@256bit.org>

src/nvim/eval/funcs.c

@@ -2019,6 +2019,9 @@ static void extend_dict(typval_T *argvars, const char *arg_errmsg, bool is_new,
 
     action = tv_get_string_chk(&argvars[2]);
     if (action == NULL) {
+      if (is_new) {
+        tv_dict_unref(d1);
+      }
       return;  // Type error; error message already given.
     }
     size_t i;
@@ -2028,6 +2031,9 @@ static void extend_dict(typval_T *argvars, const char *arg_errmsg, bool is_new,
       }
     }
     if (i == 3) {
+      if (is_new) {
+        tv_dict_unref(d1);
+      }
       semsg(_(e_invarg2), action);
       return;
     }

test/old/testdir/test_listdict.vim

@@ -1441,4 +1441,10 @@ func Test_indexof()
   delfunc TestIdx
 endfunc
 
+func Test_extendnew_leak()
+  " This used to leak memory
+  for i in range(100) | silent! call extendnew([], [], []) | endfor
+  for i in range(100) | silent! call extendnew({}, {}, {}) | endfor
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab