IOVDbSvc: Fix clang warning.

clang warning: unused private data member.

Database/IOVDbSvc/src/ReadFromFileMetaData.cxx

 /*
-  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "ReadFromFileMetaData.h"
@@ -16,8 +16,7 @@ namespace IOVDbNamespace{
   ReadFromFileMetaData::ReadFromFileMetaData( const IOVMetaDataContainer* container, 
         const IOVTime & refTime, const bool useEpochTimestamp):
         m_metaContainer(container), 
-        m_referenceTime(refTime),
-        m_isEpochTime(useEpochTimestamp){
+        m_referenceTime(refTime){
     m_payload = (container) ? (container->payloadContainer()) : (nullptr);
     if (m_payload){
       IOVPayloadContainer::const_iterator pitr=m_payload->find(m_referenceTime);

Database/IOVDbSvc/src/ReadFromFileMetaData.h

@@ -47,7 +47,6 @@ namespace IOVDbNamespace{
     const IOVMetaDataContainer* m_metaContainer{};
     IOVTime m_referenceTime{};
     const IOVPayloadContainer* m_payload{};
-    bool m_isEpochTime{};
     CondAttrListCollection * m_pptr{};
     AthenaAttributeList * m_attrList{};
     CondAttrListCollection * m_attrListColl{};
@@ -56,4 +55,4 @@ namespace IOVDbNamespace{
   
   };
 }//namespace
-#endif
+#endif
\ No newline at end of file