HID: appletb-kbd: fix "appletb_backlight" backlight device reference counting

During appletb_kbd_probe, probe attempts to get the backlight device
by name. When this happens backlight_device_get_by_name looks for a
device in the backlight class which has name "appletb_backlight" and
upon finding a match it increments the reference count for the device
and returns it to the caller. However this reference is never released
leading to a reference leak.

Fix this by decrementing the backlight device reference count on removal
via put_device and on probe failure.

Fixes: 93a0fc4894 ("HID: hid-appletb-kbd: add support for automatic brightness control while using the touchbar")
Cc: stable@vger.kernel.org
Signed-off-by: Qasim Ijaz <qasdev00@gmail.com>
Reviewed-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

drivers/hid/hid-appletb-kbd.c

@@ -438,6 +438,8 @@ static int appletb_kbd_probe(struct hid_device *hdev, const struct hid_device_id
 	return 0;
 
 close_hw:
+	if (kbd->backlight_dev)
+		put_device(&kbd->backlight_dev->dev);
 	hid_hw_close(hdev);
 stop_hw:
 	hid_hw_stop(hdev);
@@ -453,6 +455,9 @@ static void appletb_kbd_remove(struct hid_device *hdev)
 	input_unregister_handler(&kbd->inp_handler);
 	timer_delete_sync(&kbd->inactivity_timer);
 
+	if (kbd->backlight_dev)
+		put_device(&kbd->backlight_dev->dev);
+
 	hid_hw_close(hdev);
 	hid_hw_stop(hdev);
 }