phylib: unsigneds go unnoticed

both pdata->mdc and pdata->mdio are unsigned. Notice a negative
return value.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-gpio.c

@@ -200,16 +200,21 @@ static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
 {
 	struct device_node *np = NULL;
 	struct mdio_gpio_platform_data *pdata;
+	int ret;
 
 	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;
 
-	pdata->mdc = of_get_gpio(ofdev->node, 0);
-	pdata->mdio = of_get_gpio(ofdev->node, 1);
+	ret = of_get_gpio(ofdev->node, 0);
+	if (ret < 0)
+		goto out_free;
+	pdata->mdc = ret;
 
-	if (pdata->mdc < 0 || pdata->mdio < 0)
+	ret = of_get_gpio(ofdev->node, 1);
+	if (ret < 0)
                 goto out_free;
+	pdata->mdio = ret;
 
 	while ((np = of_get_next_child(ofdev->node, np)))
 		if (!strcmp(np->type, "ethernet-phy"))