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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/adfs/super.c b/fs/adfs/super.c
index c8bf36a..8e3b36a 100644
--- a/fs/adfs/super.c
+++ b/fs/adfs/super.c
@@ -126,9 +126,9 @@
 	sb->s_fs_info = NULL;
 }
 
-static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
+static int adfs_show_options(struct seq_file *seq, struct dentry *root)
 {
-	struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb);
+	struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
 
 	if (asb->s_uid != 0)
 		seq_printf(seq, ",uid=%u", asb->s_uid);