switch follow_up() to struct path

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 9f1ea31..7b2b3f7 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -173,7 +173,7 @@
 					    .dentry = dget(dparent)};
 
 			while (path.dentry == path.mnt->mnt_root &&
-			       follow_up(&path.mnt, &path.dentry))
+			       follow_up(&path))
 				;
 			dp = dget_parent(path.dentry);
 			dput(path.dentry);