analyzer warning: setAttributedTitle has copy semantics, therefore we have to release what we allocated

src/osx/cocoa/window.mm

@@ -2477,6 +2477,8 @@ void wxWidgetCocoaImpl::SetLabel( const wxString& title, wxFontEncoding encoding
 
             [(id)m_osxView setAttributedTitle:attrString];
             
+            [attrString release];
+
             return;
         }
     }