cairo-pattern: Remove some dead code
cairo-pattern: Remove some dead code

Spotted by Coverity

https://bugzilla.gnome.org/show_bug.cgi?id=697816

pixunil/cjs,pixunil/cjs,mtwebster/cjs,endlessm/gjs,pixunil/cjs,endlessm/gjs,djdeath/gjs,djdeath/gjs,endlessm/gjs,pixunil/cjs,endlessm/gjs,mtwebster/cjs,pixunil/cjs,mtwebster/cjs,djdeath/gjs,djdeath/gjs,endlessm/gjs,mtwebster/cjs,djdeath/gjs,mtwebster/cjs