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

djdeath/cogl,djdeath/cogl,collects/cogl,djdeath/cogl-android,gcampax/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl-android,Distrotech/cogl,gcampax/cogl,djdeath/cogl,collects/cogl,gcampax/cogl,djdeath/cogl-android,Distrotech/cogl,spatulasnout/cogl,spatulasnout/cogl,Distrotech/cogl