io-wq: get rid of wq->use_refs
We don't support attach anymore, so doesn't make sense to carry the
use_refs reference count. Get rid of it.
Signed-off-by: NJens Axboe <axboe@kernel.dk>
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We don't support attach anymore, so doesn't make sense to carry the
use_refs reference count. Get rid of it.
Signed-off-by: NJens Axboe <axboe@kernel.dk>