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 --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 12055fd..ac84912 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -789,7 +789,7 @@
 	    nla_put_u16(skb, IFLA_GRE_ENCAP_DPORT,
 			t->encap.dport) ||
 	    nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
-			t->encap.dport))
+			t->encap.flags))
 		goto nla_put_failure;
 
 	return 0;