coverity#735878 Dereference after null check

Change-Id: I7607cef90750b5a527ff74fd3d793ed7c3a3811c

svx/source/svdraw/svdundo.cxx

@@ -323,7 +323,7 @@ SdrUndoAttrObj::~SdrUndoAttrObj()
 void SdrUndoAttrObj::Undo()
 {
     E3DModifySceneSnapRectUpdater aUpdater(pObj);
-    bool bIs3DScene(pObj && dynamic_cast< E3dScene* >(pObj) !=  nullptr);
+    bool bIs3DScene(dynamic_cast< E3dScene* >(pObj) !=  nullptr);
 
     // Trigger PageChangeCall
     ImpShowPageOfThisObject();