DM RAID: Use safe version of rdev_for_each

Fix segfault caused by using rdev_for_each instead of rdev_for_each_safe

Commit dafb20fa34320a472deb7442f25a0c086e0feb33 mistakenly replaced a safe
iterator with an unsafe one when making some macro changes.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index b0ba524..68965e6 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -859,7 +859,7 @@
 	int ret;
 	unsigned redundancy = 0;
 	struct raid_dev *dev;
-	struct md_rdev *rdev, *freshest;
+	struct md_rdev *rdev, *tmp, *freshest;
 	struct mddev *mddev = &rs->md;
 
 	switch (rs->raid_type->level) {
@@ -877,7 +877,7 @@
 	}
 
 	freshest = NULL;
-	rdev_for_each(rdev, mddev) {
+	rdev_for_each_safe(rdev, tmp, mddev) {
 		if (!rdev->meta_bdev)
 			continue;