[NETFILTER]: nf_{conntrack,nat}_proto_udp{,lite}: annotate with const

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 4c1e67e..b8a35cc 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -30,7 +30,8 @@
 			     unsigned int dataoff,
 			     struct nf_conntrack_tuple *tuple)
 {
-	struct udphdr _hdr, *hp;
+	const struct udphdr *hp;
+	struct udphdr _hdr;
 
 	/* Actually only need first 8 bytes. */
 	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
@@ -94,7 +95,8 @@
 		     unsigned int hooknum)
 {
 	unsigned int udplen = skb->len - dataoff;
-	struct udphdr _hdr, *hdr;
+	const struct udphdr *hdr;
+	struct udphdr _hdr;
 
 	/* Header is too small? */
 	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);