server: Don't crash for wl_seat_set_touch(seat, NULL)
server: Don't crash for wl_seat_set_touch(seat, NULL)

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