message: Fix zval free.
diff: @@ -1103,7 +1103,19 @@ static PHP_METHOD(swoole_mysql_coro_statement, fetchAll)
  {
  RETURN_FALSE;
  }
  - RETURN_ZVAL(stmt->result, 0, 1);
  +
  + if (stmt->result)
  + {
  + zval *result;
  + ZVAL_ZVAL(result, stmt->result, 0, 1);
  + efree(stmt->result);
  + stmt->result = NULL;
  + RETURN_ZVAL(result, 0, 1);
  + }
  + else
  + {
  + RETURN_NULL();
  + }
  }
  static PHP_METHOD(swoole_mysql_coro_statement, __destruct)
  