netfilter: xtables: mark initial tables constant

The inputted table is never modified, so should be considered const.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/include/linux/netfilter_ipv6/ip6_tables.h b/include/linux/netfilter_ipv6/ip6_tables.h
index 1089e33..a64e145 100644
--- a/include/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/linux/netfilter_ipv6/ip6_tables.h
@@ -306,7 +306,7 @@
 extern void ip6t_init(void) __init;
 
 extern struct xt_table *ip6t_register_table(struct net *net,
-					    struct xt_table *table,
+					    const struct xt_table *table,
 					    const struct ip6t_replace *repl);
 extern void ip6t_unregister_table(struct xt_table *table);
 extern unsigned int ip6t_do_table(struct sk_buff *skb,