netfilter: queue: use NFPROTO_ for queue callsites

af is an nfproto.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 5f22c91..c156db2 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -596,7 +596,7 @@
 #ifdef CONFIG_SYSCTL
 	ipq_sysctl_header = register_sysctl_paths(net_ipv4_ctl_path, ipq_table);
 #endif
-	status = nf_register_queue_handler(PF_INET, &nfqh);
+	status = nf_register_queue_handler(NFPROTO_IPV4, &nfqh);
 	if (status < 0) {
 		printk(KERN_ERR "ip_queue: failed to register queue handler\n");
 		goto cleanup_sysctl;