block: split the blk-mq case from elevator_init
There is almost no shared logic, which leads to a very confusing code flow. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDamien Le Moal <damien.lemoal@wdc.com> Tested-by: NDamien Le Moal <damien.lemoal@wdc.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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