remove accum + fix labels filling

Author: maciacco

Steer/DigitizerWorkflow/src/IOTOFDigitizerSpec.cxx

@@ -139,10 +139,9 @@ class IOTOFDPLDigitizerTask : o2::base::BaseDPLDigitizer
     pc.outputs().snapshot(Output{mOrigin, "DIGITSROF", 0}, mROFRecords);
     if (mWithMCTruth) {
       auto& sharedlabels = pc.outputs().make<o2::dataformats::ConstMCTruthContainer<o2::MCCompLabel>>(Output{mOrigin, "DIGITSMCTR", 0});
-      mLabelsAccum.flatten_to(sharedlabels);
+      mLabels.flatten_to(sharedlabels);
       // free space of existing label containers
       mLabels.clear_andfreememory();
-      mLabelsAccum.clear_andfreememory();
 
       // write dummy MC2ROF vector to keep writer/readers backward compatible
       // NOTE: Steer/DigitizerWorkflow/src/ITSMFTDigitizerSpec.cxx also uses dummy MC2ROF
@@ -172,7 +171,6 @@ class IOTOFDPLDigitizerTask : o2::base::BaseDPLDigitizer
   std::vector<o2::itsmft::Hit> mHits{};
   std::vector<o2::itsmft::Hit>* mHitsP{&mHits};
   o2::dataformats::MCTruthContainer<o2::MCCompLabel> mLabels{};
-  o2::dataformats::MCTruthContainer<o2::MCCompLabel> mLabelsAccum{};
   std::vector<TChain*> mSimChains{};
   o2::parameters::GRPObject::ROMode mROMode = o2::parameters::GRPObject::PRESENT; // readout mode
 };