net: ipv6: Introduce ip6_sk_dst_hoplimit.

This replaces 6 identical code snippets with a call to a new
static inline function.

Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/addrconf.h
Simple merge

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

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

diff --cc net/ipv6/ip6_flowlabel.c
Simple merge

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

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

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

diff --cc net/l2tp/l2tp_ip6.c
Simple merge