desktop-shell: better error logging
desktop-shell: better error logging

v2: only call cairo_surface_status once

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