Owen W. Taylor 6d22670307 Defend against failure of cairo_pattern_get_surface()
There are quite a few crashes in retrace.fedoraproject.org that are a result of
of cairo_pattern_get_surface() failing, then a subsequent call to
cairo_image_surface_get_width() crashing because no surface was returned to the
out parameter. Knowing what causes these is hard - my best guess is widgets getting
allocated at ridiculous sizes - but avoiding the crash makes sense in any case.

See https://bugzilla.redhat.com/show_bug.cgi?id=1206754

https://bugzilla.gnome.org/show_bug.cgi?id=756983
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