compositor: Fix warning in load_module
compositor: Fix warning in load_module

udoprog/weston,giucam/weston,Fantu/compositor-spice,kwm81/weston,mchalupa/weston,sir-murray/weston,Tarnyko/weston-xdg_surface_present,sir-murray/weston,giucam/weston,kwm81/weston,xorgy/weston,mchalupa/weston,eyolfson/weston,eyolfson/weston,jonnylamb/weston,krezovic/weston,jonnylamb/weston,Fantu/compositor-spice,Tarnyko/weston-xdg_surface_present,krezovic/weston,Gnurou/weston,udoprog/weston,xorgy/weston,Fantu/compositor-spice,Gnurou/weston