netfilter: xtables: switch table AFs to nfproto

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index b35c358..0a3ae48 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -55,7 +55,7 @@
 	.name		= "filter",
 	.valid_hooks	= FILTER_VALID_HOOKS,
 	.me		= THIS_MODULE,
-	.af		= AF_INET6,
+	.af		= NFPROTO_IPV6,
 };
 
 /* The work comes in here from netfilter.c. */