net/fec: no need to check for validity of ndev in suspend and resume

dev_set_drvdata is called unconditionally in the probe function and so
it cannot be NULL.
Reported-by: NLothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/net/fec.c

@@ -1492,16 +1492,14 @@ static int
 fec_suspend(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);
-	struct fec_enet_private *fep;
+	struct fec_enet_private *fep = netdev_priv(ndev);
 
-	if (ndev) {
-		fep = netdev_priv(ndev);
 	if (netif_running(ndev)) {
 		fec_stop(ndev);
 		netif_device_detach(ndev);
 	}
 	clk_disable(fep->clk);
-	}
+
 	return 0;
 }
 
@@ -1509,16 +1507,14 @@ static int
 fec_resume(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);
-	struct fec_enet_private *fep;
+	struct fec_enet_private *fep = netdev_priv(ndev);
 
-	if (ndev) {
-		fep = netdev_priv(ndev);
 	clk_enable(fep->clk);
 	if (netif_running(ndev)) {
 		fec_restart(ndev, fep->full_duplex);
 		netif_device_attach(ndev);
 	}
-	}
+
 	return 0;
 }