netfilter: ipset: use NFPROTO_ constants

ipset is actually using NFPROTO values rather than AF (xt_set passes
that along).

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/include/linux/netfilter/ipset/ip_set.h b/include/linux/netfilter/ipset/ip_set.h
index 3540c6e..e7b06f5 100644
--- a/include/linux/netfilter/ipset/ip_set.h
+++ b/include/linux/netfilter/ipset/ip_set.h
@@ -288,7 +288,10 @@
 	u8 features;
 	/* Set type dimension */
 	u8 dimension;
-	/* Supported family: may be AF_UNSPEC for both AF_INET/AF_INET6 */
+	/*
+	 * Supported family: may be NFPROTO_UNSPEC for both
+	 * NFPROTO_IPV4/NFPROTO_IPV6.
+	 */
 	u8 family;
 	/* Type revisions */
 	u8 revision_min, revision_max;