fixup: missing refcount adjustment

Author: saghul

quickjs.c

@@ -40509,8 +40509,10 @@ static JSValue js_iterator_helper_next(JSContext *ctx, JSValue this_val,
             while (it->limit > 0) {
                 it->limit--;
                 item = JS_IteratorNext(ctx, it->obj, method, 0, NULL, pdone);
-                if (JS_IsException(item))
+                if (JS_IsException(item)) {
+                    JS_FreeValue(ctx, method);
                     goto fail;
+                }
                 JS_FreeValue(ctx, item);
                 if (magic == GEN_MAGIC_RETURN)
                     *pdone = TRUE;