inet{6}_request_sock: Init ->opt and ->pktopts in the constructor

Wei Yongjun noticed that we may call reqsk_free on request sock objects where
the opt fields may not be initialized, fix it by introducing inet_reqsk_alloc
where we initialize ->opt to NULL and set ->pktopts to NULL in
inet6_reqsk_alloc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

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

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

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

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

diff --cc net/ipv4/tcp_ipv4.c
Simple merge

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

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