message: Update MdtmMan.cpp
  Restoring warning, this will be addressed as DataMan is integrated inside ADIOS2
diff: @@ -101,7 +101,7 @@ int MdtmMan::get(void *a_data, json &a_jmsg) { return 0; }
  void MdtmMan::on_put(std::shared_ptr<std::vector<char>> a_data)
  {
  - auto writtenSize = write(m_pipe_handler, a_data->data(), a_data->size());
  + write(m_pipe_handler, a_data->data(), a_data->size());
  }
  void MdtmMan::on_recv(json &a_jmsg)
  