blk-cgroup: bypass blkcg_deactivate_policy after destroying

blkcg_deactivate_policy() can be called after blkg_destroy_all()
returns, and it isn't necessary since blkg_destroy_all has covered
policy deactivation.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20231117023527.3188627-4-ming.lei@redhat.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>