vfs: and now we can make ->mnt_master point to struct mount

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/mount.h b/fs/mount.h
index 7071d8f..d4db4c7 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -20,7 +20,7 @@
 	struct list_head mnt_mounts;	/* list of children, anchored here */
 	struct list_head mnt_child;	/* and going through their mnt_child */
 	/* yet to be moved - up to mnt_slave */
-	struct vfsmount *mnt_master;	/* slave is on master->mnt_slave_list */
+	struct mount *mnt_master;	/* slave is on master->mnt_slave_list */
 };
 
 static inline struct mount *real_mount(struct vfsmount *mnt)