eflowRec: Fix clang warnings.

    
Don't use references in a range-for if the object must be copied.

Reconstruction/eflowRec/src/PFChargedFlowElementCreatorAlgorithm.cxx

@@ -29,7 +29,7 @@ StatusCode PFChargedFlowElementCreatorAlgorithm::execute(const EventContext& ctx
   
   /* Create Charged FlowElements from all eflowCaloObjects */
   SG::ReadHandle<eflowCaloObjectContainer> eflowCaloObjectContainerReadHandle(m_eflowCaloObjectContainerReadHandleKey,ctx);
-  for (const auto& thisEflowCaloObject : *eflowCaloObjectContainerReadHandle) createChargedFlowElements(*thisEflowCaloObject,true,chargedFlowElementContainerWriteHandle);
+  for (const auto thisEflowCaloObject : *eflowCaloObjectContainerReadHandle) createChargedFlowElements(*thisEflowCaloObject,true,chargedFlowElementContainerWriteHandle);
 
   std::sort(chargedFlowElementContainerWriteHandle->begin(), chargedFlowElementContainerWriteHandle->end(), [] (const xAOD::FlowElement* flowElement1, const xAOD::FlowElement* flowElement2) {return flowElement1->pt()>flowElement2->pt();});