block: kill all_q_node in request_queue
all_q_node has not been used since commit 4b855ad3 ("blk-mq: Create hctx for each present CPU"), so remove it. Reviewed-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NHou Tao <houtao1@huawei.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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