gpio: creg-snps: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190906131032.22148-1-yuehaibing@huawei.comAcked-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-creg-snps.c

@@ -137,7 +137,6 @@ static int creg_gpio_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	struct device *dev = &pdev->dev;
 	struct creg_gpio *hcg;
-	struct resource *mem;
 	u32 ngpios;
 	int ret;
 
@@ -145,8 +144,7 @@ static int creg_gpio_probe(struct platform_device *pdev)
 	if (!hcg)
 		return -ENOMEM;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	hcg->regs = devm_ioremap_resource(dev, mem);
+	hcg->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(hcg->regs))
 		return PTR_ERR(hcg->regs);