loplugin:useuniqueptr in SvxXConnectionPreview

Change-Id: Ie634cbf418e49a2272966feafb4bbfa987cad52c
Reviewed-on: https://gerrit.libreoffice.org/55223Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/svx/connctrl.hxx

@@ -26,6 +26,7 @@
 #include <vcl/ctrl.hxx>
 #include <vcl/event.hxx>
 #include <vcl/outdev.hxx>
+#include <memory>
 
 namespace vcl { class Window; }
 
@@ -45,7 +46,7 @@ class SAL_WARN_UNUSED SVX_DLLPUBLIC SvxXConnectionPreview : public Control
 
 private:
     SdrEdgeObj*         pEdgeObj;
-    SdrPage*            pSdrPage;
+    std::unique_ptr<SdrPage> pSdrPage;
     const SdrView*      pView;
 
     SVX_DLLPRIVATE void SetStyles();

svx/source/dialog/connctrl.cxx

@@ -54,7 +54,7 @@ SvxXConnectionPreview::~SvxXConnectionPreview()
 
 void SvxXConnectionPreview::dispose()
 {
-    delete pSdrPage;
+    pSdrPage.reset();
     Control::dispose();
 }
 
@@ -161,9 +161,9 @@ void SvxXConnectionPreview::Construct()
                 // not yet one.
                 if(!pSdrPage)
                 {
-                    pSdrPage = new SdrPage(
+                    pSdrPage.reset( new SdrPage(
                         pView->getSdrModelFromSdrView(),
-                        false);
+                        false) );
                 }
 
                 const SdrEdgeObj* pTmpEdgeObj = static_cast<const SdrEdgeObj*>(pObj);