[poppler] Bug 69485

[Adrian Johnson]

I was looking at the imagemask-with-pattern.ps test case in
http://bugs.ghostscript.com/show_bug.cgi?id=689818 and noticed the "pop"
in the /PaintProc.

Does this change fix the bug?

-   /PaintProc { CairoPattern }
+   /PaintProc { pop CairoPattern }