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/ll_temac_main.c b/drivers/net/ll_temac_main.c
index 96e7248..da8d0a0 100644
--- a/drivers/net/ll_temac_main.c
+++ b/drivers/net/ll_temac_main.c
@@ -591,7 +591,7 @@
 	/* Kick off the transfer */
 	temac_dma_out32(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
 
-	return 0;
+	return NETDEV_TX_OK;
 }