drivers: net: use NETDEV_TX_OK instead of NETDEV_TX_LOCKED

These drivers already call netif_stop_queue() so we should not be called
unless tx space is available.  Just free the skb and return TX_OK.

Followup patch will remove NETDEV_TX_LOCKED from the kernel.

Cc: linux-parisc@vger.kernel.org
Cc: linux-hams@vger.kernel.org
Cc: Thomas Sailer <t.sailer@alumni.ethz.ch>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index 49fe59b..4bad0b8 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -412,8 +412,10 @@
 		dev_kfree_skb(skb);
 		return NETDEV_TX_OK;
 	}
-	if (sm->skb)
-		return NETDEV_TX_LOCKED;
+	if (sm->skb) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
 	netif_stop_queue(dev);
 	sm->skb = skb;
 	return NETDEV_TX_OK;