net: Use NET_XMIT_SUCCESS where possible.

This is based on work originally done by Patric McHardy.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_atm.c

@@ -418,7 +418,7 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 	}
 
 	ret = qdisc_enqueue(skb, flow->q);
-	if (ret != 0) {
+	if (ret != NET_XMIT_SUCCESS) {
 drop: __maybe_unused
 		if (net_xmit_drop_count(ret)) {
 			sch->qstats.drops++;
@@ -442,7 +442,7 @@ drop: __maybe_unused
 	 */
 	if (flow == &p->link) {
 		sch->q.qlen++;
-		return 0;
+		return NET_XMIT_SUCCESS;
 	}
 	tasklet_schedule(&p->task);
 	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;

net/sched/sch_sfq.c

@@ -334,7 +334,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 	if (++sch->q.qlen <= q->limit) {
 		sch->bstats.bytes += qdisc_pkt_len(skb);
 		sch->bstats.packets++;
-		return 0;
+		return NET_XMIT_SUCCESS;
 	}
 
 	sfq_drop(sch);

net/sched/sch_tbf.c

@@ -127,7 +127,7 @@ static int tbf_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 		return qdisc_reshape_fail(skb, sch);
 
 	ret = qdisc_enqueue(skb, q->qdisc);
-	if (ret != 0) {
+	if (ret != NET_XMIT_SUCCESS) {
 		if (net_xmit_drop_count(ret))
 			sch->qstats.drops++;
 		return ret;
@@ -136,7 +136,7 @@ static int tbf_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 	sch->q.qlen++;
 	sch->bstats.bytes += qdisc_pkt_len(skb);
 	sch->bstats.packets++;
-	return 0;
+	return NET_XMIT_SUCCESS;
 }
 
 static unsigned int tbf_drop(struct Qdisc* sch)

net/sched/sch_teql.c

@@ -85,7 +85,7 @@ teql_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 		__skb_queue_tail(&q->q, skb);
 		sch->bstats.bytes += qdisc_pkt_len(skb);
 		sch->bstats.packets++;
-		return 0;
+		return NET_XMIT_SUCCESS;
 	}
 
 	kfree_skb(skb);