ipv6: remove rcv_tclass of ipv6_pinfo

tclass information in now already stored in rcv_flowinfo
We do not need to store the same information twice.

Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/linux/ipv6.h
Simple merge

diff --cc net/ipv6/ipv6_sockglue.c
Simple merge

diff --cc net/ipv6/tcp_ipv6.c
Simple merge