message: mavlink_parameters: workaround to prevent crash
  Somehow this segfaults in the Android wrapper.
diff: @@ -335,7 +335,8 @@ void MavlinkParameters::process_param_ext_ack(const mavlink_message_t &message)
  if (param_ext_ack.param_result == PARAM_ACK_ACCEPTED) {
  // We are done, inform caller and go back to idle
  if (work.callback) {
  - work.callback(true);
  + // FIXME: this crashes in Android wrapper
  + //work.callback(true);
  }
  _request_state = RequestState::NONE;
  @@ -353,7 +354,8 @@ void MavlinkParameters::process_param_ext_ack(const mavlink_message_t &message)
  // We are done but unsuccessful
  // TODO: we need better error feedback
  if (work.callback) {
  - work.callback(false);
  + // FIXME: this crashes in Android wrapper
  + //work.callback(false);
  }
  _request_state = RequestState::NONE;
  