[NET_SCHED]: sch_ingress: move dependencies to Kconfig

Instead of complaining at scheduler initialization time, check the
dependencies in Kconfig.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/Kconfig

@@ -198,6 +198,7 @@ config NET_SCH_NETEM
 
 config NET_SCH_INGRESS
 	tristate "Ingress Qdisc"
+	depends on NET_CLS_ACT || NETFILTER
 	---help---
 	  Say Y here if you want to use classifiers for incoming packets.
 	  If unsure, say Y.

net/sched/sch_ingress.c

@@ -162,19 +162,10 @@ static struct nf_hook_ops ing_ops[] __read_mostly = {
 
 static int ingress_init(struct Qdisc *sch, struct rtattr *opt)
 {
-	/* Make sure either netfilter or preferably CLS_ACT is
-	 * compiled in */
 #ifndef CONFIG_NET_CLS_ACT
-#ifndef CONFIG_NETFILTER
-	printk("You MUST compile classifier actions into the kernel\n");
-	return -EINVAL;
-#else
+#ifdef CONFIG_NETFILTER
 	printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
-#endif
-#endif
 
-#ifndef CONFIG_NET_CLS_ACT
-#ifdef CONFIG_NETFILTER
 	if (!nf_registered) {
 		if (nf_register_hooks(ing_ops, ARRAY_SIZE(ing_ops)) < 0) {
 			printk("ingress qdisc registration error \n");