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/grip_mp.c b/drivers/input/joystick/grip_mp.c
index 1771d5d..555319e 100644
--- a/drivers/input/joystick/grip_mp.c
+++ b/drivers/input/joystick/grip_mp.c
@@ -599,7 +599,7 @@
 	input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
 	input_dev->id.product = 0x0100 + port->mode;
 	input_dev->id.version = 0x0100;
-	input_dev->cdev.dev = &grip->gameport->dev;
+	input_dev->dev.parent = &grip->gameport->dev;
 
 	input_set_drvdata(input_dev, grip);