message: fix cast of header object
diff: @@ -87,6 +87,7 @@ class AliAODv0;
  #include "AliESDEvent.h"
  #include "AliAODEvent.h"
  +#include "AliAODMCHeader.h"
  #include "AliV0vertexer.h"
  #include "AliCascadeVertexer.h"
  #include "AliLightV0vertexer.h"
  @@ -2687,7 +2688,7 @@ void AliAnalysisTaskStrangenessVsMultVsEffEnergyAODMCRun2::UserExec(Option_t *)
  return;
  }
  - lMCheader = static_cast<AliAODMCHeader>(lAODevent->FindListObject(AliAODMCHeader::StdBranchName()));
  + lMCheader = static_cast<AliAODMCHeader*>(lAODevent->FindListObject(AliAODMCHeader::StdBranchName()));
  if (!lMCheader) {
  AliWarning("No header found.");
  return;
  