netfilter: conntrack: udp: fix seen-reply test

IPS_SEEN_REPLY_BIT is only useful for test_bit() api.

Fixes: 4883ec51 ("netfilter: conntrack: avoid reload of ct->status")
Reported-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_conntrack_proto_udp.c

@@ -104,7 +104,7 @@ int nf_conntrack_udp_packet(struct nf_conn *ct,
 	/* If we've seen traffic both ways, this is some kind of UDP
 	 * stream. Set Assured.
 	 */
-	if (status & IPS_SEEN_REPLY_BIT) {
+	if (status & IPS_SEEN_REPLY) {
 		unsigned long extra = timeouts[UDP_CT_UNREPLIED];
 		bool stream = false;