c49423ca2c
If we don't have a region in the X no MIT-SHM case don't go using
the damage call set region.
Fixes: bbdf7e45b1 ("wsi/x11: Hook up KHR_incremental_present")
Reviewed-by: Adam Jackson <ajax@redhat.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33592>