message: move tileError sync prior to activating async messaging
diff: @@ -183,7 +183,6 @@ namespace ospray {
  delayedMessage = this->delayedMessage;
  this->delayedMessage.clear();
  - tileErrorRegion.sync();
  numTilesCompletedThisFrame = 0;
  if (hasAccumBuffer) {
  @@ -592,6 +591,10 @@ namespace ospray {
  void DistributedFrameBuffer::beginFrame()
  {
  + // NOTE: Doing error sync may do a broadcast, needs to be done before async
  + // messaging enabled
  + tileErrorRegion.sync();
  +
  mpi::messaging::enableAsyncMessaging();
  FrameBuffer::beginFrame();
  }
  