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>

Index: linux-upstream/drivers/md/dm-raid.c
================================================== =================
--- linux-upstream.orig/drivers/md/dm-raid.c
+++ linux-upstream/drivers/md/dm-raid.c
@@ -861,7 +861,7 @@ static int analyse_superblocks(struct dm
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) {
@@ -879,7 +879,7 @@ static int analyse_superblocks(struct dm
}

freshest = NULL;
- rdev_for_each(rdev, mddev) {
+ rdev_for_each_safe(rdev, tmp, mddev) {
if (!rdev->meta_bdev)
continue;



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