[cogl-debug] avoid warnings when using COGL_NOTE with unbraced else clauses
[cogl-debug] avoid warnings when using COGL_NOTE with unbraced else clauses

When not building a debug build the compiler was warning about empty
else clauses with no braces due to code like:
  if (blah)
	do_foo();
  else
	COGL_NOTE (DRAW, "a-wibble");

This simply ensures that even for non debug builds COGL_NOTE will expand to
a single statement.

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