blk-mq: do not reset plug->rq_count before the list is sorted
We would never be able to sort the list if we first reset plug->rq_count which is used in conditional check later. Fixes: ce5b009c ("block: improve logic around when to sort a plug list") Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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