loplugin:useuniqueptr in AccessibleCell

Change-Id: I8502e7695ad9d28d57d1cb5c7f01c7bacd4a69aa
Reviewed-on: https://gerrit.libreoffice.org/55517Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

svx/source/table/accessiblecell.cxx

@@ -83,7 +83,7 @@ void AccessibleCell::Init()
         {
             // non-empty text -> use full-fledged edit source right away
 
-            mpText = new AccessibleTextHelper( o3tl::make_unique<SvxTextEditSource>(mxCell->GetObject(), mxCell.get(), *pView, *pWindow) );
+            mpText.reset( new AccessibleTextHelper( o3tl::make_unique<SvxTextEditSource>(mxCell->GetObject(), mxCell.get(), *pView, *pWindow) ) );
             if( mxCell.is() && mxCell.get()->IsActiveCell() )
                 mpText->SetFocus();
             mpText->SetEventSource(this);
@@ -520,8 +520,7 @@ void AccessibleCell::disposing()
     if (mpText != nullptr)
     {
         mpText->Dispose();
-        delete mpText;
-        mpText = nullptr;
+        mpText.reset();
     }
 
     // Cleanup.  Remove references to objects to allow them to be

svx/source/table/accessiblecell.hxx

@@ -119,7 +119,7 @@ protected:
     sal_Int32 mnIndexInParent;
 
     /// The accessible text engine.  May be NULL if it can not be created.
-    AccessibleTextHelper* mpText;
+    std::unique_ptr<AccessibleTextHelper> mpText;
 
     sdr::table::CellRef mxCell;