blk-mq: use switch/case to improve readability in blk_mq_try_issue_list_directly
Use switch/case handle error as other function do to improve readability in blk_mq_try_issue_list_directly. Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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