net: use NETDEV_TX_OK instead of 0 in ndo_start_xmit() functions

This patch is the result of an automatic spatch transformation to convert
all ndo_start_xmit() return values of 0 to NETDEV_TX_OK.

Some occurences are missed by the automatic conversion, those will be
handled in a seperate patch.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/irda/donauboe.c b/drivers/net/irda/donauboe.c
index 9a0346e..1484c76 100644
--- a/drivers/net/irda/donauboe.c
+++ b/drivers/net/irda/donauboe.c
@@ -1021,7 +1021,7 @@
             {
 	      spin_unlock_irqrestore(&self->spinlock, flags);
               dev_kfree_skb (skb);
-              return 0;
+              return NETDEV_TX_OK;
             }
           /* True packet, go on, but */
           /* do not accept anything before change speed execution */
@@ -1036,7 +1036,7 @@
           toshoboe_setbaud (self);
 	  spin_unlock_irqrestore(&self->spinlock, flags);
           dev_kfree_skb (skb);
-          return 0;
+          return NETDEV_TX_OK;
         }
 
     }
@@ -1143,7 +1143,7 @@
   spin_unlock_irqrestore(&self->spinlock, flags);
   dev_kfree_skb (skb);
 
-  return 0;
+  return NETDEV_TX_OK;
 }
 
 /*interrupt handler */