blk-mq: move cancel of requeue_work into blk_mq_release

With holding queue's kobject refcount, it is safe for driver
to schedule requeue. However, blk_mq_kick_requeue_list() may
be called after blk_sync_queue() is done because of concurrent
requeue activities, then requeue work may not be completed when
freeing queue, and kernel oops is triggered.

So moving the cancel of requeue_work into blk_mq_release() for
avoiding race between requeue and freeing queue.

Cc: Dongli Zhang <[email protected]>
Cc: James Smart <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: [email protected],
Cc: Martin K . Petersen <[email protected]>,
Cc: Christoph Hellwig <[email protected]>,
Cc: James E . J . Bottomley <[email protected]>,
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Tested-by: James Smart <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

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