Pekka Paalanen authored Sep 16, 2019 and Jonas Ådahl committed Jan 16, 2020

Simplify the bo freeing functions by not checking what the copy mode is. This
matches what swap_secondary_drm_fb () already does. g_clear_object () is safe
to call even if the value is already NULL.

The copy mode does not change mid-operation. If it did, this change would
ensure we still clean up everything. So this is more future-proof too.

!810