message: Fix binary security of table keys
diff: @@ -763,7 +763,7 @@ static PHP_METHOD(swoole_table, key) {
  TableRow *row = table->current();
  if (row) {
  row->lock();
  - RETVAL_STRING(row->key);
  + RETVAL_STRINGL(row->key, row->key_len);
  row->unlock();
  } else {
  RETURN_NULL();
  