We had a bug reported with a touchscreen where we could end up
in here with a NULL cursor, so let's not crash the X server.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-and-Tested-by: Daniel Martin <consume.noise@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>