net: relax PKTINFO non local ipv6 udp xmit check

Allow transparent sockets to be less restrictive about
the source ip of ipv6 udp packets being sent.

Google-Bug-Id: 5018138
Signed-off-by: Maciej Żenczykowski <maze@google.com>
CC: "Erik Kline" <ek@google.com>
CC: "Lorenzo Colitti" <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
index 5271a74..498433d 100644
--- a/include/net/transp_v6.h
+++ b/include/net/transp_v6.h
@@ -39,6 +39,7 @@
 						  struct sk_buff *skb);
 
 extern int			datagram_send_ctl(struct net *net,
+						  struct sock *sk,
 						  struct msghdr *msg,
 						  struct flowi6 *fl6,
 						  struct ipv6_txoptions *opt,