[cairo] pixman patch: correctly reset pixman image matrix back to identity

[Vladimir Vukicevic]

If a pixman image had a non-identity matrix set, followed by an identity 
one, the identity matrix never took -- the wrong variable was being 
assigned to.  This manifests it self when you draw a scaled image, 
followed by the same image unscaled -- the second draw also results in a 
scaled image, because the source matrix is never reset.

Soren, let me know if it's ok to commit this.

     - Vlad
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