loplugin:useuniqueptr in ImplListBoxWindow

Change-Id: I9966baf9fd490fec4fb808f7e70470eb690dbc9e
Reviewed-on: https://gerrit.libreoffice.org/53350Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

vcl/inc/listbox.hxx

@@ -165,7 +165,7 @@ public:
 class ImplListBoxWindow : public Control, public vcl::ISearchableStringList
 {
 private:
-    ImplEntryList*  mpEntryList;     ///< EntryList
+    std::unique_ptr<ImplEntryList> mpEntryList;     ///< EntryList
     tools::Rectangle       maFocusRect;
 
     Size            maUserItemSize;
@@ -255,7 +255,7 @@ public:
     virtual         ~ImplListBoxWindow() override;
     virtual void    dispose() override;
 
-    ImplEntryList*  GetEntryList() const { return mpEntryList; }
+    ImplEntryList*  GetEntryList() const { return mpEntryList.get(); }
 
     sal_Int32       InsertEntry( sal_Int32  nPos, ImplEntryType* pNewEntry );
     void            RemoveEntry( sal_Int32  nPos );

vcl/source/control/imp_listbox.cxx

@@ -461,7 +461,7 @@ ImplListBoxWindow::ImplListBoxWindow( vcl::Window* pParent, WinBits nWinStyle )
     Control( pParent, 0 ),
     maQuickSelectionEngine( *this )
 {
-    mpEntryList         = new ImplEntryList( this );
+    mpEntryList.reset(new ImplEntryList( this ));
 
     mnTop               = 0;
     mnLeft              = 0;
@@ -508,7 +508,7 @@ ImplListBoxWindow::~ImplListBoxWindow()
 
 void ImplListBoxWindow::dispose()
 {
-    delete mpEntryList;
+    mpEntryList.reset();
     Control::dispose();
 }