message: Clear errCode.
diff: @@ -140,6 +140,10 @@ static PHP_METHOD(swoole_channel_coro, push)
  zend_update_property_long(swoole_channel_coro_class_entry_ptr, getThis(), ZEND_STRL("errCode"), SW_CHANNEL_CLOSED);
  RETURN_FALSE;
  }
  + else
  + {
  + zend_update_property_long(swoole_channel_coro_class_entry_ptr, getThis(), ZEND_STRL("errCode"), SW_CHANNEL_OK);
  + }
  zval *zdata;
  double timeout = -1;
  @@ -173,6 +177,10 @@ static PHP_METHOD(swoole_channel_coro, pop)
  zend_update_property_long(swoole_channel_coro_class_entry_ptr, getThis(), ZEND_STRL("errCode"), SW_CHANNEL_CLOSED);
  RETURN_FALSE;
  }
  + else
  + {
  + zend_update_property_long(swoole_channel_coro_class_entry_ptr, getThis(), ZEND_STRL("errCode"), SW_CHANNEL_OK);
  + }
  double timeout = -1;
  if (zend_parse_parameters(ZEND_NUM_ARGS(), "|d", &timeout) == FAILURE)
  