Input: handle serio_register_driver() errors

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/touchscreen/gunze.c b/drivers/input/touchscreen/gunze.c
index 44f397f..9157eb1 100644
--- a/drivers/input/touchscreen/gunze.c
+++ b/drivers/input/touchscreen/gunze.c
@@ -194,8 +194,7 @@
 
 static int __init gunze_init(void)
 {
-	serio_register_driver(&gunze_drv);
-	return 0;
+	return serio_register_driver(&gunze_drv);
 }
 
 static void __exit gunze_exit(void)