bug#3112: 23.0.92; segfault in display-supports-face-attributes-p

[Chong Yidong]

> I figured out how to reproduce this segfault:
>
> Set .emacs to the following:
>
> (custom-set-faces
>  '(default ((t (:height 121 :family "something-invalid")))))
>
> Then start emacs and let the mouse hover over something that would
> display a tooltip.  After a second or so you'll get the segfault.

I can't reproduce this crash with the recipe you provided.  Hovering the
mouse over the buffer name in the mode-line, or over one of the links in
the startup screen, displays a tooltip with no crash.  I also did
`xrdb -remove' to clear my X resources---again, no crash with the
recipe.