net: fix network drivers ndo_start_xmit() return values (part 8)

Fix up USB drivers that return an errno value (result of usb_submit_urb())
to qdisc_restart(), causing qdisc_restart() to print a warning and requeue/
retransmit the skb.

- hso: skb is freed: use after free
- at76_usb: skb is freed: use after free

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

drivers/net/usb/hso.c

@@ -816,7 +816,7 @@ static int hso_net_start_xmit(struct sk_buff *skb, struct net_device *net)
 	}
 	dev_kfree_skb(skb);
 	/* we're done */
-	return result;
+	return NETDEV_TX_OK;
 }
 
 static void hso_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)

drivers/staging/at76_usb/at76_usb.c

@@ -3242,12 +3242,11 @@ static int at76_tx(struct sk_buff *skb, struct net_device *netdev)
 			       "%s: -EINVAL: tx urb %p hcpriv %p complete %p\n",
 			       priv->netdev->name, priv->tx_urb,
 			       priv->tx_urb->hcpriv, priv->tx_urb->complete);
-	} else {
+	} else
 		stats->tx_bytes += skb->len;
-		dev_kfree_skb(skb);
-	}
 
-	return ret;
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
 }
 
 static void at76_tx_timeout(struct net_device *netdev)