compositor-x11: Add error handling in x11_compositor_create()
compositor-x11: Add error handling in x11_compositor_create()

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