compositor: Make types consistent for bitshifting unsigned ints
compositor: Make types consistent for bitshifting unsigned ints

Fantu/compositor-spice,Gnurou/weston,Fantu/compositor-spice,sir-murray/weston,Gnurou/weston,giucam/weston,Fantu/compositor-spice,krezovic/weston,giucam/weston,krezovic/weston,sir-murray/weston