s390/cio: use kobj_to_dev() API

Use kobj_to_dev() API instead of container_of().

Reviewed-by: Cornelia Huck <[e-mail]>
Signed-off-by: chenqiwu <[e-mail]>
Signed-off-by: chenqiwu <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

drivers/s390/cio/chp.c

···
 	struct channel_path *chp;
 	struct device *device;
 
-	device = container_of(kobj, struct device, kobj);
+	device = kobj_to_dev(kobj);
 	chp = to_channelpath(device);
 	if (chp->cmg == -1)
 		return 0;
···
 	struct device *device;
 	unsigned int size;
 
-	device = container_of(kobj, struct device, kobj);
+	device = kobj_to_dev(kobj);
 	chp = to_channelpath(device);
 	css = to_css(chp->dev.parent);