null_blk: convert file-scope mutex users to guard(mutex)

Using guard()/scoped_guard() ties lock release to scope exit, removing the
need for manual mutex_unlock() calls and preventing missed unlocks on error
paths.

The per-attribute apply wrappers are left untouched, as those are reworked
separately by the configfs show/store serialization patches.

Signed-off-by: Zizhi Wo <wozizhi@huawei.com>
Link: https://patch.msgid.link/20260725022509.714271-9-wozizhi@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions