No OOM in save_cmdline_alloc()

src/nvim/ex_getln.c

@@ -2307,10 +2307,8 @@ char_u *save_cmdline_alloc(void)
  */
 void restore_cmdline_alloc(char_u *p)
 {
-  if (p != NULL) {
   restore_cmdline((struct cmdline_info *)p);
   free(p);
-  }
 }
 
 /*

src/nvim/getchar.c

@@ -3724,10 +3724,6 @@ eval_map_expr (
   vim_unescape_csi(expr);
 
   save_cmd = save_cmdline_alloc();
-  if (save_cmd == NULL) {
-    free(expr);
-    return NULL;
-  }
 
   /* Forbid changing text or using ":normal" to avoid most of the bad side
    * effects.  Also restore the cursor position. */