fou: Fix typo in returning flags in netlink

When filling netlink info, dport is being returned as flags. Fix
instances to return correct value.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

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

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