net: constify struct inet6_protocol

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
index 4818c48..d737a27 100644
--- a/net/ipv6/udplite.c
+++ b/net/ipv6/udplite.c
@@ -25,7 +25,7 @@
 	__udp6_lib_err(skb, opt, type, code, offset, info, &udplite_table);
 }
 
-static struct inet6_protocol udplitev6_protocol = {
+static const struct inet6_protocol udplitev6_protocol = {
 	.handler	=	udplitev6_rcv,
 	.err_handler	=	udplitev6_err,
 	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,