block, bfq: remove unnecessary dereference to get async_bfqq

The async_bfqq is assigned with bfqq->bic->bfqq[0], use it directly.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230116095153.3810101-6-shikemeng@huaweicloud.com


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