c
static int gpio_chrdev_release(struct inode *inode, struct file *file)
{
	// Patch Option 3:  Free and set to NULL in one step (if such a function exists)
	struct gpio_chardev_data *cdev = file->private_data;
	struct gpio_device *gdev = cdev->gdev;

	safe_bitmap_free(&cdev->watched_lines); // Hypothetical function

	blocking_notifier_chain_unregister(&gdev->device_notifier,
					   &cdev->device_unregistered_nb);
	blocking_notifier_chain_unregister(&gdev->line_state_notifier,
					   &cdev->lineinfo_changed_nb);
	gpio_device_put(gdev);
	kfree(cdev);

	return 0;
}
