i2c: isch: Use devm_request_region()

Use devm_request_region() to make cleanup paths simpler.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-isch.c

@@ -275,7 +275,8 @@ static int smbus_sch_probe(struct platform_device *dev)
 	if (!res)
 		return -EBUSY;
 
-	if (!request_region(res->start, resource_size(res), dev->name)) {
+	if (!devm_request_region(&dev->dev, res->start, resource_size(res),
+				 dev->name)) {
 		dev_err(&dev->dev, "SMBus region 0x%x already in use!\n",
 			sch_smba);
 		return -EBUSY;
@@ -294,7 +295,6 @@ static int smbus_sch_probe(struct platform_device *dev)
 	retval = i2c_add_adapter(&sch_adapter);
 	if (retval) {
 		dev_err(&dev->dev, "Couldn't register adapter!\n");
-		release_region(res->start, resource_size(res));
 		sch_smba = 0;
 	}
 
@@ -303,11 +303,8 @@ static int smbus_sch_probe(struct platform_device *dev)
 
 static int smbus_sch_remove(struct platform_device *pdev)
 {
-	struct resource *res;
 	if (sch_smba) {
 		i2c_del_adapter(&sch_adapter);
-		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-		release_region(res->start, resource_size(res));
 		sch_smba = 0;
 	}