message: remove addref
diff: @@ -342,7 +342,6 @@ int sw_coro_resume(php_context *sw_current_context, zval *retval, zval *coro_ret
  EG(current_execute_data)->opline--;
  if (EG(current_execute_data)->opline->result_type != IS_UNUSED)
  {
  - sw_zval_add_ref(&retval);
  ZVAL_COPY(SWCC(current_coro_return_value_ptr), retval);
  }
  EG(current_execute_data)->opline++;
  