message: do not flood the logs, set return size to zero when disabling GPU tracker due to stuck GPU
diff: @@ -600,7 +600,11 @@ int AliHLTTPCCATrackerComponent::DoEvent
  tmpPar.fOutputBlocks = &outputBlocks;
  static int trackerTimeout = 0;
  - if (trackerTimeout) return(-ENODEV);
  + if (trackerTimeout)
  + {
  + size = 0;
  + return(0);
  + }
  int retVal;
  if (fAsync)
  @@ -610,6 +614,7 @@ int AliHLTTPCCATrackerComponent::DoEvent
  {
  HLTError( "Tracking timed out, disabling this tracker instance" );
  trackerTimeout = 1;
  + size = 0;
  return(-ENODEV);
  }
  else
  