Fix compilation warning
Fix compilation warning

Declare the width and height variables as unsigned ints, in order
to match the required arguments for clutter_actor_get_size().

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