Fix some compiler warnings
Fix some compiler warnings

GCC complains that some variable might be used uninitialized.

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