launcher: Drop unecessary checks for drm_fd == -1
launcher: Drop unecessary checks for drm_fd == -1

We never get into this case, and if we do, we just want to pass the invalid
fd through to the underlying ioctl and get the error that way."

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