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/ethernet/amd/7990.c b/drivers/net/ethernet/amd/7990.c
index 66d0b73c..8e75755 100644
--- a/drivers/net/ethernet/amd/7990.c
+++ b/drivers/net/ethernet/amd/7990.c
@@ -543,11 +543,13 @@
 	static int outs;
 	unsigned long flags;
 
-	if (!TX_BUFFS_AVAIL)
-		return NETDEV_TX_LOCKED;
-
 	netif_stop_queue(dev);
 
+	if (!TX_BUFFS_AVAIL) {
+		dev_consume_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
 	skblen = skb->len;
 
 #ifdef DEBUG_DRIVER