net: Fix thinko in backport of skb destructor fix.

As noticed by Oliver Hartkopp, the backport of the
'net: Partially allow skb destructors to be used on receive path'
(2.6.30.y commit: 172570a224fe66d560c097e48fca15b620c76e72,
 upstream commit: d55d87fdff8252d0e2f7c28c2d443aee17e9d70f)
was buggy.

It should have added an skb_orphan() call to both skb_set_owner_w()
and skb_set_owner_r().  Instead it added two calls to skb_set_owner_r().

This fixes it up.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/include/net/sock.h b/include/net/sock.h
index 9bc2c83..cda3801 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1223,6 +1223,7 @@
 
 static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
 {
+	skb_orphan(skb);
 	sock_hold(sk);
 	skb->sk = sk;
 	skb->destructor = sock_wfree;
@@ -1232,7 +1233,6 @@
 static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
 {
 	skb_orphan(skb);
-	skb_orphan(skb);
 	skb->sk = sk;
 	skb->destructor = sock_rfree;
 	atomic_add(skb->truesize, &sk->sk_rmem_alloc);