Using FairMQChannel::Send instead of SendAsync which is deprecated

FairMQ is going to deprecate the asyncronous version of Send and Receive,
following the suggestion in the warning, Send is used now.
"For non-blocking Send, use timeout version with timeout of 0"

Utilities/QC/QCMerger/src/MergerDevice.cxx

@@ -243,13 +243,13 @@ size_t MergerDevice::sendMergedObjectToViewer(TObject* dataObject)
   unique_ptr<FairMQMessage> viewerRequest(fTransportFactory->CreateMessage(
     viewerMessage->Buffer(), viewerMessage->BufferSize(), deleteTMessage, viewerMessage));
   size_t messageSize = viewerRequest->GetSize();
-  if ((respondeCode = fChannels.at("data-out").at(0).SendAsync(viewerRequest)) == -2) {
-    if ((respondeCode = fChannels.at("data-out").at(0).SendAsync(viewerRequest)) == -2) {
+  if ((respondeCode = fChannels.at("data-out").at(0).Send(viewerRequest, 0)) == -2) {
+    if ((respondeCode = fChannels.at("data-out").at(0).Send(viewerRequest, 0)) == -2) {
       mLastSendBufferOverloadTime = clock();
       mSendBufferOverloaded = true;
       LOG(DEBUG) << "Buffer of data-out channel is full. Waiting for free buffer...";
 
-      while ((respondeCode = fChannels.at("data-out").at(0).SendAsync(viewerRequest)) == -2) {
+      while ((respondeCode = fChannels.at("data-out").at(0).Send(viewerRequest, 0)) == -2) {
         this_thread::sleep_for(chrono::milliseconds(10));
       }