loplugin:useuniqueptr in PrintDialog

Change-Id: Ia40e48b2e57624bb59bc0dcc0927bf673581081d
Reviewed-on: https://gerrit.libreoffice.org/53346Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

vcl/inc/printdlg.hxx

@@ -168,7 +168,7 @@ namespace vcl
             void storeToSettings();
         };
 
-        VclBuilder*                             mpCustomOptionsUIBuilder;
+        std::unique_ptr<VclBuilder>             mpCustomOptionsUIBuilder;
 
         std::shared_ptr<PrinterController>      maPController;
         VclPtr<TabControl>                      mpTabCtrl;

vcl/source/window/printdlg.cxx

@@ -798,7 +798,7 @@ PrintDialog::~PrintDialog()
 
 void PrintDialog::dispose()
 {
-    delete mpCustomOptionsUIBuilder;
+    mpCustomOptionsUIBuilder.reset();
     mpTabCtrl.clear();
     mpPreviewWindow.clear();
     mpPageEdit.clear();
@@ -908,8 +908,7 @@ void PrintDialog::setupOptionalUI()
 
             vcl::Window *pCustom = get<vcl::Window>("customcontents");
 
-            delete mpCustomOptionsUIBuilder;
-            mpCustomOptionsUIBuilder = new VclBuilder(pCustom, getUIRootDir(), sOptionsUIFile);
+            mpCustomOptionsUIBuilder.reset(new VclBuilder(pCustom, getUIRootDir(), sOptionsUIFile));
             vcl::Window *pWindow = mpCustomOptionsUIBuilder->get_widget_root();
             pWindow->Show();
             continue;