net: fix network drivers ndo_start_xmit() return values (part 3)

net: fix network drivers ndo_start_xmit() return values (part 3)

Fix up wireless drivers that return an errno value to qdisc_restart(), causing
qdisc_restart() to print a warning an requeue/retransmit the skb.

- airo: transmission not implemented for chip, intention is to free and abort
- ipw2200: transmission not implemented for promiscous mode, intention is to
           drop
- prism54: intention is to drop
- wl3501_cs: intention appears to be to drop
- zd1201: error counter indicates intention is to drop

All drivers compile tested.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 9eabf4d..dfb30b9 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -2193,7 +2193,8 @@
 	if (test_bit(FLAG_MPI, &priv->flags)) {
 		/* Not implemented yet for MPI350 */
 		netif_stop_queue(dev);
-		return -ENETDOWN;
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
 	}
 
 	if ( skb == NULL ) {