tsnep: Do not print DMA mapping error

Printing in data path shall be avoided. DMA mapping error is already
counted in stats so printing is not necessary.
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/engleder/tsnep_main.c

@@ -463,8 +463,6 @@ static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb,
 
 		tx->dropped++;
 
-		netdev_err(tx->adapter->netdev, "TX DMA map failed\n");
-
 		return NETDEV_TX_OK;
 	}
 	length = retval;