[cairo] Fix for potential crash in pixman-compose.c

Antoine Azar cairo at antoineazar.com
Wed Feb 13 23:32:55 PST 2008

Hey guys,

here's a patch that fixes a potential crash in pixman-compose.c when 
a box is used in some cases while not allocated or initialized. Mea 
culpa, the bug was introduced in my refactoring of the 
fbFetchTransform. The fix was not necessary in every fetch function 
but it makes the code more consistent and safer for future changes. 
Thanks to Soeren for spotting it!

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