md: remove typedefs: mddev_t -> struct mddev

Having mddev_t and 'struct mddev_s' is ugly and not preferred

Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/multipath.h b/drivers/md/multipath.h
index 034f838..350a631 100644
--- a/drivers/md/multipath.h
+++ b/drivers/md/multipath.h
@@ -6,7 +6,7 @@
 };
 
 struct multipath_private_data {
-	mddev_t			*mddev;
+	struct mddev			*mddev;
 	struct multipath_info	*multipaths;
 	int			raid_disks;
 	spinlock_t		device_lock;
@@ -24,7 +24,7 @@
  */
 
 struct multipath_bh {
-	mddev_t			*mddev;
+	struct mddev			*mddev;
 	struct bio		*master_bio;
 	struct bio		bio;
 	int			path;