cogl-material: Fix the warning for when too many layers are used
cogl-material: Fix the warning for when too many layers are used

The warning displayed when too many layers are used had an off-by-one
error so that it would display even if exactly the maximum number is
used. There was also a missing space at the end of the line in the
message which looked wrong when displayed on the terminal.

http://bugzilla.openedhand.com/show_bug.cgi?id=2064

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