message: One more fix to work with ROOT6
diff: @@ -6,7 +6,7 @@ AliAnalysisTaskADCalib* AddTaskADCalib(Int_t bcExtrapolationMin=9,
  AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
  if (!mgr) {
  Error("AddTask_ADCalib", "No analysis manager found.");
  - return MNULL;
  + return NULL;
  }
  if (!mgr->GetInputEventHandler()) {
  