wayland-server: Fix up error handling with client creation.
wayland-server: Fix up error handling with client creation.

bitfactor/wayland,mchalupa/wayland,eyolfson/wayland,sir-murray/wayland,tulcod/wayland,sir-murray/wayland,abooij/wayland,abooij/wayland,tulcod/wayland,eyolfson/wayland,abooij/wayland,tulcod/wayland,eyolfson/wayland,mchalupa/wayland,mchalupa/wayland,sir-murray/wayland,bitfactor/wayland,bitfactor/wayland