[cairo] Segfault with PS surface

[Adrian Johnson]

Torsten Schoenfeld wrote:
> Aloha,
> 
> the attached test case results in a segfault here with cairo from git.
> The first fix was easy enough; attached.  Unfortunately, that wasn't
> enough.  I get a new crash now:

The cause of this bug is that cairo_surface_finish() does not set the
surface->finished flag to TRUE if the backend->finish() function returns
an error status. This results in the backend->finish() function being
called twice. Attached is the patch to fix this.
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