[PATCH][2.6] fix compilation w/o CONFIG_XFRM

[Zwane Mwaikambo <zwane@xxxxxxxxxxxxxxxx>]

Index: linux-2.6.0-test8/net/ipv6/sit.c
===================================================================
RCS file: /build/cvsroot/linux-2.6.0-test8/net/ipv6/sit.c,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 sit.c
--- linux-2.6.0-test8/net/ipv6/sit.c    18 Oct 2003 01:37:19 -0000      1.1.1.1
+++ linux-2.6.0-test8/net/ipv6/sit.c    18 Oct 2003 04:13:21 -0000
@@ -377,8 +377,10 @@ static int ipip6_rcv(struct sk_buff *skb
 
        read_lock(&ipip6_lock);
        if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
+#ifdef CONFIG_XFRM
                secpath_put(skb->sp);
                skb->sp = NULL;
+#endif
                skb->mac.raw = skb->nh.raw;
                skb->nh.raw = skb->data;
                memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));