switch 9p

here we actually *want* ->d_op for root; setting it allows to get rid
of kludge in v9fs_kill_super() since now we have proper ->d_release()
for root and don't need to call it manually.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index 466d2a4..233b7d4 100644
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -86,7 +86,7 @@
  *
  */
 
-void v9fs_dentry_release(struct dentry *dentry)
+static void v9fs_dentry_release(struct dentry *dentry)
 {
 	struct v9fs_dentry *dent;
 	struct p9_fid *temp, *current_fid;