net: 3c574_cs fix stats.tx_bytes counter

Update the stats counter calculation in 3c574_cs, similar
to the method used in 3c589_cs. This corrects the contents
of the counter on tests using a "Megahertz 574B" card.

[linux@dominikbrodowski.net: clean up commit message]
Signed-off-by: Alexander Kurz <linux@kbdbabel.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pcmcia/3c574_cs.c

@@ -781,8 +781,13 @@ static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
 		  inw(ioaddr + EL3_STATUS));
 
 	spin_lock_irqsave(&lp->window_lock, flags);
+
+	dev->stats.tx_bytes += skb->len;
+
+	/* Put out the doubleword header... */
 	outw(skb->len, ioaddr + TX_FIFO);
 	outw(0, ioaddr + TX_FIFO);
+	/* ... and the packet rounded to a doubleword. */
 	outsl(ioaddr + TX_FIFO, skb->data, (skb->len+3)>>2);
 
 	dev->trans_start = jiffies;
@@ -1021,8 +1026,6 @@ static void update_stats(struct net_device *dev)
 	/* BadSSD */				   inb(ioaddr + 12);
 	up					 = inb(ioaddr + 13);
 
-	dev->stats.tx_bytes 			+= tx + ((up & 0xf0) << 12);
-
 	EL3WINDOW(1);
 }