[NETFILTER]: constify nf_afinfo

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index c550257..b636ca6 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -708,7 +708,7 @@
 				 union nf_conntrack_address *dst,
 				 int family)
 {
-	struct nf_afinfo *afinfo;
+	const struct nf_afinfo *afinfo;
 	struct flowi fl1, fl2;
 	int ret = 0;