[cairo] error handling

[Chris Wilson]

Baz (brian.ewins at gmail.com) said: 
> There's two problems here: the scaled font was in an error state, and
> that didn't propogate to the cairo_t; and the scaled font was in an
> error state for no good reason, we should have returned a status_t
> instead. The first problem is something we should just fix, right?

AIUI, I completely agree with you here...
These are a couple of patches I have hanging around that should fixup
this oversight.
--
Chris Wilson
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