davinci_emac: off by one

This off by one error was found by smatch.

drivers/net/davinci_emac.c +2390 emac_dev_open(13) error: buffer overflow 'priv->mac_addr' 6 <= 6
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/davinci_emac.c

@@ -2385,7 +2385,7 @@ static int emac_dev_open(struct net_device *ndev)
 	struct emac_priv *priv = netdev_priv(ndev);
 
 	netif_carrier_off(ndev);
-	for (cnt = 0; cnt <= ETH_ALEN; cnt++)
+	for (cnt = 0; cnt < ETH_ALEN; cnt++)
 		ndev->dev_addr[cnt] = priv->mac_addr[cnt];
 
 	/* Configuration items */