dm cache: small cleanups related to deferred prison cell cleanup

Eliminate __cell_release() since it only had one caller that always
released the cell holder.

Switch cell_error_with_code() to using free_prison_cell() for the sake
of consistency.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2015-08-31 15:41:34 -04:00
commit dc9cee5db5