return NULL from a function returning a pointer, not FALSE

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15157 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/menu.cpp

@@ -306,7 +306,7 @@ bool wxMenuBar::Insert(size_t pos, wxMenu *menu, const wxString& title)
 wxMenu *wxMenuBar::Replace(size_t pos, wxMenu *menu, const wxString& title)
 {
     if ( !wxMenuBarBase::Replace(pos, menu, title) )
-        return FALSE;
+        return NULL;
 
     wxFAIL_MSG(wxT("TODO"));