net: use symbolic values for ndo_start_xmit() return codes

Convert magic values 1 and -1 to NETDEV_TX_BUSY and NETDEV_TX_LOCKED respectively.

0 (NETDEV_TX_OK) is not changed to keep the noise down, except in very few cases
where its in direct proximity to one of the other values.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/wavelan.c b/drivers/net/wireless/wavelan.c
index 25d27b6..ab7fc5c 100644
--- a/drivers/net/wireless/wavelan.c
+++ b/drivers/net/wireless/wavelan.c
@@ -2867,7 +2867,7 @@
 		spin_unlock_irqrestore(&lp->spinlock, flags);
 		/* Check that we can continue */
 		if (lp->tx_n_in_use == (NTXBLOCKS - 1))
-			return 1;
+			return NETDEV_TX_BUSY;
 	}
 
 	/* Do we need some padding? */
@@ -2880,10 +2880,10 @@
 		skb_copy_from_linear_data(skb, data, skb->len);
 		/* Write packet on the card */
 		if(wv_packet_write(dev, data, ETH_ZLEN))
-			return 1;	/* We failed */
+			return NETDEV_TX_BUSY;	/* We failed */
 	}
 	else if(wv_packet_write(dev, skb->data, skb->len))
-		return 1;	/* We failed */
+		return NETDEV_TX_BUSY;	/* We failed */
 
 
 	dev_kfree_skb(skb);