Remove wrong TODO

Change-Id: I9d3744a802b6d213fa5ac32f6e7a24537cba1970
Reviewed-on: https://gerrit.libreoffice.org/24941
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

vcl/unx/gtk/gtksalmenu.cxx

@@ -974,7 +974,7 @@ namespace
         GtkSalMenu* pSalSubMenu = reinterpret_cast<GtkSalMenu*>(sGtkSalMenu.toInt64());
 
         assert(sWindow == "window" && pSalSubMenu);
-        (void) sWindow; // TODO should we throw an exception ?
+        (void) sWindow;
 
         return MenuAndId(pSalSubMenu, sItemId.toInt32());
     }