vfs: switch ->show_options() to struct dentry *

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 8a89949..7b76695 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1238,9 +1238,9 @@
 STATIC int
 xfs_fs_show_options(
 	struct seq_file		*m,
-	struct vfsmount		*mnt)
+	struct dentry		*root)
 {
-	return -xfs_showargs(XFS_M(mnt->mnt_sb), m);
+	return -xfs_showargs(XFS_M(root->d_sb), m);
 }
 
 /*