power: reset: at91-reset: use devm_of_iomap

Use devm_of_iomap() to map resources. This will avoid the necessity to
track the mapped resources and free them on failure path or on remove.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Suggested-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/reset/at91-reset.c

@@ -192,7 +192,7 @@ static int __init at91_reset_probe(struct platform_device *pdev)
 	if (!reset)
 		return -ENOMEM;
 
-	reset->rstc_base = of_iomap(pdev->dev.of_node, 0);
+	reset->rstc_base = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL);
 	if (!reset->rstc_base) {
 		dev_err(&pdev->dev, "Could not map reset controller address\n");
 		return -ENODEV;
@@ -202,7 +202,7 @@ static int __init at91_reset_probe(struct platform_device *pdev)
 		/* we need to shutdown the ddr controller, so get ramc base */
 		for_each_matching_node_and_match(np, at91_ramc_of_match, &match) {
 			reset->ramc_lpr = (u32)match->data;
-			reset->ramc_base[idx] = of_iomap(np, 0);
+			reset->ramc_base[idx] = devm_of_iomap(&pdev->dev, np, 0, NULL);
 			if (!reset->ramc_base[idx]) {
 				dev_err(&pdev->dev, "Could not map ram controller address\n");
 				of_node_put(np);