message: action_server: fix heap corruption on destruction
  We need to make sure no callbacks are called once detructed.
diff: @@ -196,7 +196,10 @@ void ActionServerImpl::init()
  this);
  }
  -void ActionServerImpl::deinit() {}
  +void ActionServerImpl::deinit()
  +{
  + _parent->unregister_all_mavlink_command_handlers(this);
  +}
  void ActionServerImpl::enable() {}
  