md: change ITERATE_RDEV to rdev_for_each

As this is more in line with common practice in the kernel.  Also swap the
args around to be more like list_for_each.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index cf2ddce..d107ddc 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -294,7 +294,7 @@
 	}
 	conf->nfaults = 0;
 
-	ITERATE_RDEV(mddev, rdev, tmp)
+	rdev_for_each(rdev, tmp, mddev)
 		conf->rdev = rdev;
 
 	mddev->array_size = mddev->size;