md: remove unnecessary check on mddev

mddev is never NULL and neither is ->bio_set, so
remove the check.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Ming Lei 2017-02-14 23:29:02 +08:00 • committed by Shaohua Li
commit ed7ef732ca