The ret is not needed anymore since we have already
move resync_start into md_do_sync in commit 41a9a0dc.
Reviewed-by: NNeilBrown <neilb@suse.com>
Signed-off-by: NGuoqing Jiang <gqjiang@suse.com>
Signed-off-by: NShaohua Li <shli@fb.com>