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/joystick/warrior.c b/drivers/input/joystick/warrior.c
index 1e4828b..29d339a 100644
--- a/drivers/input/joystick/warrior.c
+++ b/drivers/input/joystick/warrior.c
@@ -224,8 +224,7 @@
 
 static int __init warrior_init(void)
 {
-	serio_register_driver(&warrior_drv);
-	return 0;
+	return serio_register_driver(&warrior_drv);
 }
 
 static void __exit warrior_exit(void)