phy: hix5hd2-sata: Check return value of platform_get_resource

This prevent NULL pointer dereference if res is NULL.

Signed-off-by: Axel Lin <[e-mail]>
Acked-by: Zhangfei Gao <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/phy-hix5hd2-sata.c

···
 		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;