net: use SPEED_UNKNOWN and DUPLEX_UNKNOWN when appropriate

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vmxnet3/vmxnet3_ethtool.c

@@ -431,8 +431,8 @@ vmxnet3_get_settings(struct net_device *netdev, struct ethtool_cmd *ecmd)
 		ethtool_cmd_speed_set(ecmd, adapter->link_speed);
 		ecmd->duplex = DUPLEX_FULL;
 	} else {
-		ethtool_cmd_speed_set(ecmd, -1);
-		ecmd->duplex = -1;
+		ethtool_cmd_speed_set(ecmd, SPEED_UNKNOWN);
+		ecmd->duplex = DUPLEX_UNKNOWN;
 	}
 	return 0;
 }