avoid infinite recursion when de-reffing ServiceHandle

See merge request !235

GaudiKernel/GaudiKernel/ServiceHandle.h

@@ -73,10 +73,11 @@ public:
 //   }
 
   /// Allow non const access to the service, even from a const handle...
-  T * get() const { return this->nonConst( GaudiHandle<T>::get() ); }
+  T * get() const { return GaudiHandle<T>::nonConst( GaudiHandle<T>::get() ); }
 
   /// Allow non const access to the service, even from a const handle...
-  T * operator->() const { return this->nonConst( GaudiHandle<T>::operator->() ); }
+  T* operator->() const { return GaudiHandle<T>::nonConst( GaudiHandle<T>::operator->() ); }
+  T& operator*() const { return * GaudiHandle<T>::nonConst( GaudiHandle<T>::operator->() ); }
 
 protected:
  /** Do the real retrieval of the Service. */