[NETFILTER]: Drop conntrack reference in ip_call_ra_chain()/ip_mr_input()

Drop reference before handing the packets to raw_rcv()

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv4/ip_input.c
Simple merge

diff --cc net/ipv4/ipmr.c
Simple merge