[SK_BUFF]: More skb_put related skb_reset_transport_header

This time we have to set it to skb->tail that is not anymore equal to
skb->data, so we either add a new helper or just add the skb->tail - skb->data
offset, for now do the later.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 8f0df7b..b0efd27 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -333,7 +333,8 @@
 	((u8*)&pip[1])[2] = 0;
 	((u8*)&pip[1])[3] = 0;
 
-	skb->h.raw = skb_put(skb, sizeof(*pig));
+	skb->h.raw = skb->nh.raw + sizeof(struct iphdr) + 4;
+	skb_put(skb, sizeof(*pig));
 	pig = igmpv3_report_hdr(skb);
 	pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 	pig->resv1 = 0;