[php-src] PR #25365: Fix memory leak in filter_var_array() when a nested element throws

Pull Request: https://github.com/php/php-src/pull/25365 Author: eyupcanakman php_filter_array_handler() filters a copy of each input value, nval, and returns as soon as an exception is pending. It never frees that copy, so an array value leaks. ```php filter_var_array(['a' => ['1', 'x']], ['a' => ['filter' => FILTER_VALIDATE_INT, 'flags' => FILTER_REQUIRE_ARRAY | FILTER_THROW_ON_FAILURE]]); ``` On a debug build the exception is followed by === Total 2 memory leaks detected ===. A FILTER_CALLBACK callback that throws on a nested element leaks the same way, and so does filter_input_array(), which uses the same handler. The early return came in with FILTER_THROW_ON_FAILURE, so PHP-8.4 does not have it and does not leak. GH-25349 adds the return to 8.4 with the copy already freed.