[cairo] pixman patch: rasterize traps that extend outside of the image bounds correctly

[Vladimir Vukicevic]

Traps that extend outside of the image bounds are rasterized incorrectly 
currently; the problem is a signed vs. unsigned comparison that got 
introduced when a width parameter went from int -> uint.  This patch 
puts it back to int (since it's stored as an int in the bits structure 
to begin with), and also fixes a similar warning in the memset wrapper 
(though cairo will never hit that I don't think, since it's only used in 
the pixel accessors case).

Let me know if this looks ok to commit.

Thanks,
     - Vlad
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