loplugin:useuniqueptr in TabControl

Change-Id: I4d6ce243c92de740fbb5b6934aaf14dbe28eb18e
Reviewed-on: https://gerrit.libreoffice.org/53351Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/tabctrl.hxx

@@ -50,7 +50,7 @@ class ListBox;
 class VCL_DLLPUBLIC TabControl : public Control
 {
 protected:
-    ImplTabCtrlData*    mpTabCtrlData;
+    std::unique_ptr<ImplTabCtrlData> mpTabCtrlData;
     long                mnLastWidth;
     long                mnLastHeight;
     long                mnMaxPageWidth;

vcl/source/control/tabctrl.cxx

@@ -98,7 +98,7 @@ void TabControl::ImplInit( vcl::Window* pParent, WinBits nStyle )
     mbFormat                    = true;
     mbRestoreHelpId             = false;
     mbSmallInvalidate           = false;
-    mpTabCtrlData               = new ImplTabCtrlData;
+    mpTabCtrlData.reset(new ImplTabCtrlData);
     mpTabCtrlData->mpListBox    = nullptr;
 
     ImplInitSettings( true );
@@ -198,8 +198,7 @@ void TabControl::dispose()
     // delete TabCtrl data
     if (mpTabCtrlData)
         mpTabCtrlData->mpListBox.disposeAndClear();
-    delete mpTabCtrlData;
-    mpTabCtrlData = nullptr;
+    mpTabCtrlData.reset();
     Control::dispose();
 }