[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 --cc net/ipv4/igmp.c
Simple merge

diff --cc net/ipv4/ipvs/ip_vs_xmit.c
Simple merge

diff --cc net/ipv6/mcast.c
Simple merge

diff --cc net/ipv6/ndisc.c
Simple merge