compositor-drm: finish frame if initial page-flip fails
compositor-drm: finish frame if initial page-flip fails

If the initial page-flip fails, immediately finish the frame to avoid
being stuck in the given frame. We already do this if we have no fbo
available. Now we do the same if the page-flip fails.

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