net: macb: Only call GPIO functions if there is a valid GPIO

GPIOlib will print warning messages if we call GPIO functions without a
valid GPIO. Change the code to avoid doing so.
Signed-off-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb.c

@@ -2996,10 +2996,11 @@ static int macb_probe(struct platform_device *pdev)
 	phy_node =  of_get_next_available_child(np, NULL);
 	if (phy_node) {
 		int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
-		if (gpio_is_valid(gpio))
+		if (gpio_is_valid(gpio)) {
 			bp->reset_gpio = gpio_to_desc(gpio);
 			gpiod_direction_output(bp->reset_gpio, 1);
 		}
+	}
 	of_node_put(phy_node);
 
 	err = of_get_phy_mode(np);
@@ -3068,6 +3069,7 @@ static int macb_remove(struct platform_device *pdev)
 		mdiobus_free(bp->mii_bus);
 
 		/* Shutdown the PHY if there is a GPIO reset */
+		if (bp->reset_gpio)
 			gpiod_set_value(bp->reset_gpio, 0);
 
 		unregister_netdev(dev);