sh: Create an sh debugfs root.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index ab81c60..0b0ec6e 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -393,7 +393,7 @@
 	struct dentry *dentry;
 
 	dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
-				     NULL, NULL, &pmb_debugfs_fops);
+				     sh_debugfs_root, NULL, &pmb_debugfs_fops);
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);