patch for ownership problem in bonobo-uih-menu.c

[Nat Friedman <nat helixcode com>]

John Sullivan writes:
 > Here's another patch for a problem Nautilus has run into with bonobo menus.
 > When quitting, the bonobo menu items are destroyed in the normal way by the
 > widget hierarchy being torn down, then they get accessed in bonobo and spew
 > GTK-CRITICALs all over the place.
 > 
 > Should I go ahead and commit this simple change? I'm not sure if there's
 > some other solution, but these two gtk_object_ref calls fix the symptom.

That looks to me like the correct solution.  Thanks for helping out so 
much, John.  I feel bad about that code but have been too busy to work 
on it lately.

Nat