[cairo] Reducing CPU usage in News Ticker Implementation

[Chris Wilson]

Darwin Bautista (djclue917 at gmail.com) said: 
> I'm getting segfaults when using Cairo git HEAD with the latest stable
> versions of GTK+, PyGTK, Pango, and PyCairo. What were the versions
> that you used to test the patch? BTW, I've rebuilt all the concerned
> packages when I tested your patch (but still, segfaults occur after
> calling gtk.main() ). Thanks again.

Oops, make check showed that I was dereferencing a NULL clip. Updated
patch attached. If it still fails, can you post a stack trace or
valgrind log?
--
Chris Wilson
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