attempt to address reported loplugin:vclwidgets warning

Change-Id: I6ccefa2d5d1c57cf9f1c4041d14c92d03ded1333

include/vcl/menu.hxx

@@ -413,7 +413,7 @@ class VCL_DLLPUBLIC MenuBar : public Menu
     bool mbFloatBtnVisible : 1;
     bool mbHideBtnVisible : 1;
     bool mbDisplayable : 1;
-    SystemWindow* mpAssociatedSystemWindow;
+    VclPtr<SystemWindow> mxAssociatedSystemWindow;
 
     friend class Application;
     friend class Menu;

vcl/source/window/menu.cxx

@@ -2494,9 +2494,9 @@ MenuBar::MenuBar(SystemWindow* pAssociatedSystemWindow)
       mbFloatBtnVisible(false),
       mbHideBtnVisible(false),
       mbDisplayable(true),
-      mpAssociatedSystemWindow(pAssociatedSystemWindow)
+      mxAssociatedSystemWindow(pAssociatedSystemWindow)
 {
-    mpSalMenu = ImplGetSVData()->mpDefInst->CreateMenu(true, this, mpAssociatedSystemWindow);
+    mpSalMenu = ImplGetSVData()->mpDefInst->CreateMenu(true, this, mxAssociatedSystemWindow.get());
 }
 
 MenuBar::MenuBar( const MenuBar& rMenu )
@@ -2506,7 +2506,7 @@ MenuBar::MenuBar( const MenuBar& rMenu )
       mbHideBtnVisible(false),
       mbDisplayable(true)
 {
-    mpSalMenu = ImplGetSVData()->mpDefInst->CreateMenu(true, this, mpAssociatedSystemWindow);
+    mpSalMenu = ImplGetSVData()->mpDefInst->CreateMenu(true, this, mxAssociatedSystemWindow.get());
     *this = rMenu;
 }