watchdog: armada_37xx_wdt: remove struct resource

No need for it with devm_platform_ioremap_resource. Simplifies probe
slightly.

Signed-off-by: Rosen Penev <[e-mail]>
Reviewed-by: Marek Behún <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/armada_37xx_wdt.c

···
 static int armada_37xx_wdt_probe(struct platform_device *pdev)
 {
 	struct armada_37xx_watchdog *dev;
-	struct resource *res;
 	struct regmap *regmap;
 	int ret;
 
···
 		return PTR_ERR(regmap);
 	dev->cpu_misc = regmap;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-	dev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
-	if (!dev->reg)
-		return -ENOMEM;
+	dev->reg = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dev->reg))
+		return PTR_ERR(dev->reg);
 
 	/* init clock */
 	dev->clk = devm_clk_get_enabled(&pdev->dev, NULL);