vim-patch:9.1.1649: attrs allocation and fuzzy growarray could leak (#35383)

Problem:  attrs allocation and fuzzy growarray could leak on early
          returns
Solution: Ensure proper cleanup of allocated memory on exit paths
          (glepnir)

closes: vim/vim#18038

c7c10f8c11

Co-authored-by: glepnir <glephunter@gmail.com>

src/nvim/popupmenu.c

@@ -460,6 +460,10 @@ static int *pum_compute_text_attrs(char *text, hlf_T hlf, int user_hlattr)
 
   if (in_fuzzy) {
     ga = fuzzy_match_str_with_pos(text, leader);
+    if (!ga) {
+      xfree(attrs);
+      return NULL;
+    }
   }
 
   const char *ptr = text;