[cairo] OOM handling in _cairo_gstate_init_copy()

[Owen Taylor]

The handling of out-of-memory in _cairo_gstate_init_copy() looks
like it needs some checking over; the code doesn't seem to 
handle in early bailout, members like gstate->font and
gstate->clip.region have been copied over from the values of
other but not duplicated/referenced.

I think it needs to be rewritten to do all the allocation upfront
and only start updating the members of gstate when everything
succeeds.

Regards,
					Owen

(Also, OOM handling for gstate->pattern looks wrong throughout
the file; the code assumes pattern != NULL even for _fini).


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