gpio: ixp4xx: Use devm_platform_ioremap_resource()

Convert platform_get_resource(),devm_ioremap_resource() to a single
call to devm_platform_ioremap_resource(), as this is exactly what this
function does.
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-ixp4xx.c

@@ -199,7 +199,6 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct irq_domain *parent;
-	struct resource *res;
 	struct ixp4xx_gpio *g;
 	struct gpio_irq_chip *girq;
 	struct device_node *irq_parent;
@@ -210,8 +209,7 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	g->dev = dev;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	g->base = devm_ioremap_resource(dev, res);
+	g->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(g->base))
 		return PTR_ERR(g->base);