[cairo] libpixman leak when rasterizing trapezoids

[Carl Worth]

On Wed, 11 May 2005 22:52:04 -0700, Keith Packard wrote:
> libpixman creates an A8 format object and sometimes forgets to destroy
> it (when the bounds of the trapezoids are empty).
> 
> Here's a patch which avoids creating the format object in that case.

That looks fine (as always, memory management in C is a pain).

Please commit.

-Carl
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