vfs: spread struct mount - get_dominating_id / do_make_slave

next pile of horrors, similar to mnt_parent one; this time it's
mnt_master.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/pnode.h b/fs/pnode.h
index 0a7a919..33f1e3c 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h
@@ -35,7 +35,7 @@
 int propagate_umount(struct list_head *);
 int propagate_mount_busy(struct mount *, int);
 void mnt_release_group_id(struct mount *);
-int get_dominating_id(struct vfsmount *mnt, const struct path *root);
+int get_dominating_id(struct mount *mnt, const struct path *root);
 unsigned int mnt_get_count(struct mount *mnt);
 void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
 			struct mount *);