unobfuscate follow_up() a bit

really convoluted test in there has grown up during struct mount
introduction; what it checks is that we'd reached the root of
mount tree.

parent de9b9422

fs/namei.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -722,7 +722,7 @@ int follow_up(struct path *path)

		br_read_lock(&vfsmount_lock);
		parent = mnt->mnt_parent;
		if (&parent->mnt == path->mnt) {
		if (parent == mnt) {
		br_read_unlock(&vfsmount_lock);
		return 0;
		}