Input: joysticks - switch to using input_dev->dev.parent

In preparation for struct class_device -> struct device input
core conversion, switch to using input_dev->dev.parent when
specifying device position in sysfs tree.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/joystick/spaceball.c b/drivers/input/joystick/spaceball.c
index dd611de..abb7c4c 100644
--- a/drivers/input/joystick/spaceball.c
+++ b/drivers/input/joystick/spaceball.c
@@ -226,7 +226,7 @@
 	input_dev->id.vendor = SERIO_SPACEBALL;
 	input_dev->id.product = id;
 	input_dev->id.version = 0x0100;
-	input_dev->cdev.dev = &serio->dev;
+	input_dev->dev.parent = &serio->dev;
 
 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);