message: Fix MySQL prepare return true
diff: @@ -504,9 +504,11 @@ static int swoole_mysql_coro_statement_free(mysql_statement *stmt)
  static int swoole_mysql_coro_statement_close(mysql_statement *stmt)
  {
  + // WARNING: it's wrong operation, we send the close statement package silently, don't change any property in the client!
  + // stmt->client->cmd = SW_MYSQL_COM_STMT_CLOSE;
  +
  // call mysql-server to destruct this statement
  swString_clear(mysql_request_buffer);
  - stmt->client->cmd = SW_MYSQL_COM_STMT_CLOSE;
  bzero(mysql_request_buffer->str, 5);
  //command
  mysql_request_buffer->str[4] = SW_MYSQL_COM_STMT_CLOSE;
  