Removed unused variable warning

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70672 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextbuffer.cpp

@@ -12441,6 +12441,7 @@ wxRichTextAttr wxRichTextDrawingContext::GetVirtualAttributes(wxRichTextObject*
         {
             bool success = handler->GetVirtualAttributes(attr, obj);
             wxASSERT(success);
+            wxUnusedVar(success);
         }
 
         node = node->GetNext();