HID: wacom: cleanup input devices

Just some cleaning up when the input devices are unregistered.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/wacom_sys.c

@@ -1357,6 +1357,9 @@ static void wacom_clean_inputs(struct wacom *wacom)
 	wacom->wacom_wac.pen_input = NULL;
 	wacom->wacom_wac.touch_input = NULL;
 	wacom->wacom_wac.pad_input = NULL;
+	wacom->wacom_wac.pen_registered = false;
+	wacom->wacom_wac.touch_registered = false;
+	wacom->wacom_wac.pad_registered = false;
 	wacom_destroy_leds(wacom);
 }