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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 804e129..8be4925 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -96,9 +96,9 @@
 	}
 }
 
-static int jffs2_show_options(struct seq_file *s, struct vfsmount *mnt)
+static int jffs2_show_options(struct seq_file *s, struct dentry *root)
 {
-	struct jffs2_sb_info *c = JFFS2_SB_INFO(mnt->mnt_sb);
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
 	struct jffs2_mount_opts *opts = &c->mount_opts;
 
 	if (opts->override_compr)