netfilter: xtables: switch table AFs to nfproto

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index 1442df7..28647f1 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -68,7 +68,7 @@
 	.name		= "mangle",
 	.valid_hooks	= MANGLE_VALID_HOOKS,
 	.me		= THIS_MODULE,
-	.af		= AF_INET,
+	.af		= NFPROTO_IPV4,
 };
 
 /* The work comes in here from netfilter.c. */