net: use NETDEV_TX_OK instead of 0 in ndo_start_xmit() functions

This patch is the result of an automatic spatch transformation to convert
all ndo_start_xmit() return values of 0 to NETDEV_TX_OK.

Some occurences are missed by the automatic conversion, those will be
handled in a seperate patch.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index bc4976a..2a6b6de 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -553,7 +553,7 @@
 		dev->stats.tx_dropped++;
 		spin_unlock_irqrestore(&lp->lock, flags);
 		dev_kfree_skb(skb);
-		return 0;
+		return NETDEV_TX_OK;
 	}
 
 #ifdef SMC_USE_DMA
@@ -566,7 +566,7 @@
 			lp->pending_tx_skb = skb;
 			netif_stop_queue(dev);
 			spin_unlock_irqrestore(&lp->lock, flags);
-			return 0;
+			return NETDEV_TX_OK;
 		} else {
 			DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, "%s: Activating Tx DMA\n", dev->name);
 			lp->txdma_active = 1;
@@ -577,7 +577,7 @@
 	smc911x_hardware_send_pkt(dev);
 	spin_unlock_irqrestore(&lp->lock, flags);
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /*