message: camera: fix variable shadowing
  GCC 11 told me about this.
diff: @@ -1738,12 +1738,12 @@ void CameraImpl::format_storage_async(Camera::ResultCallback callback)
  cmd_format, [this, callback](MavlinkCommandSender::Result result, float progress) {
  UNUSED(progress);
  - receive_command_result(result, [this, callback](Camera::Result result) {
  - if (result == Camera::Result::Success) {
  + receive_command_result(result, [this, callback](Camera::Result camera_result) {
  + if (camera_result == Camera::Result::Success) {
  _status.photo_list.clear();
  }
  - callback(result);
  + callback(camera_result);
  });
  });
  }
  