forcedeth: remove unnecessary carrier status check

Since netif_carrier_on() will do nothing if device's
carrier is already on, so it's unnecessary to do
carrier status check.

It's the same for netif_carrier_off().
Signed-off-by: NZhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/nvidia/forcedeth.c

@@ -4248,11 +4248,9 @@ static int nv_get_link_ksettings(struct net_device *dev,
 		/* We do not track link speed / duplex setting if the
 		 * interface is disabled. Force a link check */
 		if (nv_update_linkspeed(dev)) {
-			if (!netif_carrier_ok(dev))
-				netif_carrier_on(dev);
+			netif_carrier_on(dev);
 		} else {
-			if (netif_carrier_ok(dev))
-				netif_carrier_off(dev);
+			netif_carrier_off(dev);
 		}
 	}