phy: hix5hd2-sata: Check return value of platform_get_resource

This prevent NULL pointer dereference if res is NULL.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/phy-hix5hd2-sata.c

@@ -147,6 +147,9 @@ static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
 	priv->base = devm_ioremap(dev, res->start, resource_size(res));
 	if (!priv->base)
 		return -ENOMEM;