netfilter: nf_conntrack_dccp: use %s format string for buffer

Some invocations of nf_log_packet() use arg buffer directly instead of
"%s" format string with follow-up buffer pointer. Currently, these two
usages are not really critical, but we should fix this up nevertheless
so that we don't run into trouble if that changes one day.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_conntrack_proto_dccp.c

@@ -457,7 +457,7 @@ static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
 out_invalid:
 	if (LOG_INVALID(net, IPPROTO_DCCP))
 		nf_log_packet(net, nf_ct_l3num(ct), 0, skb, NULL, NULL,
-			      NULL, msg);
+			      NULL, "%s", msg);
 	return false;
 }
 
@@ -614,7 +614,7 @@ static int dccp_error(struct net *net, struct nf_conn *tmpl,
 
 out_invalid:
 	if (LOG_INVALID(net, IPPROTO_DCCP))
-		nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, msg);
+		nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "%s", msg);
 	return -NF_ACCEPT;
 }