Merge branch 'egammaValidation_uninitialized_pointer' into 'master'

Initializing rootHistSvc pointer in the egammaValidation package

See merge request atlas/athena!12134

Reconstruction/egamma/egammaValidation/src/EgammaMonitoring.h

@@ -45,8 +45,8 @@ class EgammaMonitoring : public AthAlgorithm
  public:
 
   /// Tools and services ///
-  ITHistSvc*    rootHistSvc;
-
+  ITHistSvc*    rootHistSvc = nullptr;
+ 
   egammaMonitoring::EffIDPlots  Eff_ID  ;
   egammaMonitoring::EffRecPlots Eff_Reco;