[NETFILTER]: Introduce NF_INET_ hook values

The IPv4 and IPv6 hook values are identical, yet some code tries to figure
out the "correct" value by looking at the address family. Introduce NF_INET_*
values for both IPv4 and IPv6. The old values are kept in a #ifndef __KERNEL__
section for userspace compatibility.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 3f8335e..d377dec 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -235,7 +235,7 @@
 	.hook           = ing_hook,
 	.owner		= THIS_MODULE,
 	.pf             = PF_INET,
-	.hooknum        = NF_IP_PRE_ROUTING,
+	.hooknum        = NF_INET_PRE_ROUTING,
 	.priority       = NF_IP_PRI_FILTER + 1,
 };
 
@@ -243,7 +243,7 @@
 	.hook           = ing_hook,
 	.owner		= THIS_MODULE,
 	.pf             = PF_INET6,
-	.hooknum        = NF_IP6_PRE_ROUTING,
+	.hooknum        = NF_INET_PRE_ROUTING,
 	.priority       = NF_IP6_PRI_FILTER + 1,
 };