don't pass nameidata to ->follow_link()

its only use is getting passed to nd_jump_link(), which can obtain
it from current->nameidata

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 26c4dcb..7f51f39 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -416,8 +416,7 @@
 STATIC const char *
 xfs_vn_follow_link(
 	struct dentry		*dentry,
-	void			**cookie,
-	struct nameidata	*nd)
+	void			**cookie)
 {
 	char			*link;
 	int			error = -ENOMEM;