message: Return false when we are not in fetch mode.
diff: @@ -1234,6 +1234,11 @@ static PHP_METHOD(swoole_mysql_coro_statement, fetch)
  RETURN_FALSE;
  }
  + if (!stmt->client->connector.fetch_mode)
  + {
  + RETURN_FALSE;
  + }
  +
  if (stmt->result)
  {
  zval **args[1];
  @@ -1283,6 +1288,11 @@ static PHP_METHOD(swoole_mysql_coro_statement, fetchAll)
  RETURN_FALSE;
  }
  + if (!stmt->client->connector.fetch_mode)
  + {
  + RETURN_FALSE;
  + }
  +
  if (stmt->result)
  {
  zval _result = *stmt->result;
  @@ -1305,6 +1315,11 @@ static PHP_METHOD(swoole_mysql_coro_statement, nextResult)
  RETURN_FALSE;
  }
  + if (!stmt->client->connector.fetch_mode)
  + {
  + RETURN_FALSE;
  + }
  +
  mysql_client *client = stmt->client;
  if (!client->cli)
  {
  