[glx-texture-pixmap] Unref a cogl texture handle.
[glx-texture-pixmap] Unref a cogl texture handle.

According to clutter_texture_set_cogl_texture you should unref the handle as
the texture takes its own.

Signed-off-by: Robert Bragg <12e9293ec6b30c7fa8a0926af42807e929c1684f@linux.intel.com>

rkudiyarov/clutter_osx,Distrotech/clutter,nobled/clutter,heysion/clutter-clone,tardyp/clutter,heysion/clutter-clone,djdeath/clutter-android,rkudiyarov/clutter_osx,Distrotech/clutter,GNOME/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,heysion/clutter-clone,Distrotech/clutter,collects/clutter,spatulasnout/clutter,jigpu/clutter,djdeath/clutter-android,GNOME/clutter,collects/clutter,jigpu/clutter,ebassi/clutter,spatulasnout/clutter,ebassi/clutter,jigpu/clutter,djdeath/clutter-multithreaded,djdeath/clutter-multithreaded,heysion/clutter-clone,collects/clutter,ebassi/clutter,djdeath/clutter-android,djdeath/clutter-multithreaded,rkudiyarov/clutter_osx,djdeath/clutter,kerrickstaley/clutter-vala,djdeath/clutter-multithreaded,djdeath/clutter-android,tardyp/clutter,GNOME/clutter,nobled/clutter,heysion/clutter-clone,spatulasnout/clutter,ebassi/clutter,nobled/clutter,jigpu/clutter,djdeath/clutter,dlespiau/clutter,jigpu/clutter,rkudiyarov/clutter_osx,tardyp/clutter,jigpu/clutter,collects/clutter,dlespiau/clutter,djdeath/clutter,dlespiau/clutter,djdeath/clutter,GNOME/clutter,kerrickstaley/clutter-vala,djdeath/clutter-android,kerrickstaley/clutter-vala,djdeath/clutter,collects/clutter,GNOME/clutter,Distrotech/clutter,ebassi/clutter,djdeath/clutter,Distrotech/clutter,Distrotech/clutter,spatulasnout/clutter