class_err = class_device_create(msr_class, MKDEV(MSR_MAJOR, i), NULL, "msr%d",i);
class_err = class_device_create(msr_class, NULL, MKDEV(MSR_MAJOR, i), NULL, "msr%d",i);
static int msr_class_device_create(int i){	int err = 0;	struct class_device *class_err;	class_err = class_device_create(msr_class, MKDEV(MSR_MAJOR, i), NULL, "msr%d",i);	if (IS_ERR(class_err)) 		err = PTR_ERR(class_err);	return err;}