md-cluster: call md_kick_rdev_from_array once ack failed
The new_disk_ack could return failure if WAITING_FOR_NEWDISK is not set, so we need to kick the dev from array in case failure happened. And we missed to check err before call new_disk_ack othwise we could kick a rdev which isn't in array, thanks for the reminder from Shaohua. Reviewed-by: NNeilBrown <neilb@suse.com> Signed-off-by: NGuoqing Jiang <gqjiang@suse.com> Signed-off-by: NShaohua Li <shli@fb.com>
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