[NET_SCHED]: Fix prio/ingress classification logic error

Fix handling of empty or completely non-matching filter chains. In
that case -1 is returned and tcf_result is uninitialized, the
qdisc should fall back to default classification in that case.

Noticed by PJ Waskiewicz <peter.p.waskiewicz.jr@intel.com>.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_ingress.c

@@ -158,9 +158,8 @@ static int ingress_enqueue(struct sk_buff *skb,struct Qdisc *sch)
 			break;
 		case TC_ACT_RECLASSIFY:
 		case TC_ACT_OK:
-		case TC_ACT_UNSPEC:
-		default:
 			skb->tc_index = TC_H_MIN(res.classid);
+		default:
 			result = TC_ACT_OK;
 			break;
 	}