pasemi_mac: ethtool get settings fix

Not all pasemi mac interfaces can have a phy attached.
For example, XAUI has no phy and phydev is NULL for it.
In this case ethtool get settings causes kernel crash.
Fix it by returning -EOPNOTSUPP if there's no PHY attached.
Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pasemi_mac_ethtool.c

@@ -71,6 +71,9 @@ pasemi_mac_ethtool_get_settings(struct net_device *netdev,
 	struct pasemi_mac *mac = netdev_priv(netdev);
 	struct phy_device *phydev = mac->phydev;
 
+	if (!phydev)
+		return -EOPNOTSUPP;
+
 	return phy_ethtool_gset(phydev, cmd);
 }