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: 172570a2,
 upstream commit: d55d87fd

)
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>

include/net/sock.h

@@ -1223,6 +1223,7 @@ static inline int skb_copy_to_page(struct sock *sk, char __user *from,
 
 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;
@@ -1231,7 +1232,6 @@ static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
 
 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;