Replaced defined(FORCE_INIT_OF_VARS) with UNINIT_VAR().

Better to avoid #ifdef in the main code if possible.

Author: montywi

sql/item_jsonfunc.cc

@@ -1727,17 +1727,14 @@ bool Item_func_json_contains_path::val_bool()
   uint n_arg;
   longlong result;
   json_path_t p;
-  int n_found;
-  int array_sizes[JSON_DEPTH_LIMIT];
-  uint has_negative_path= 0;
-#if defined(FORCE_INIT_OF_VARS)
   /*
-    Initialization force not required after gcc 13.3
-    where it correctly sees that an uninitialized read
-    of n_found doesn't occur with mode_one being true.
+    Initialization force not required after gcc 13.3 where it
+    correctly sees that an uninitialized read of n_found doesn't occur
+    with mode_one being true.
   */
-  n_found= 0; 
-#endif
+  int UNINIT_VAR(n_found);
+  int array_sizes[JSON_DEPTH_LIMIT];
+  uint has_negative_path= 0;
 
   if ((null_value= args[0]->null_value))
     return 0;