[NETFILTER]: nf_{conntrack,nat}_proto_gre: 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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
index b887ebb42133..a1e4da16da2e 100644
--- a/net/ipv4/netfilter/nf_nat_proto_gre.c
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -104,7 +104,7 @@ gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff,
 {
         struct gre_hdr *greh;
         struct gre_hdr_pptp *pgreh;
-        struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
+        const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
         unsigned int hdroff = iphdroff + iph->ihl * 4;
 
         /* pgreh includes two optional 32bit fields which are not required