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/interact.c b/drivers/input/joystick/interact.c
index f0ff783..1aec1e9 100644
--- a/drivers/input/joystick/interact.c
+++ b/drivers/input/joystick/interact.c
@@ -262,6 +262,7 @@
 	input_dev->id.vendor = GAMEPORT_ID_VENDOR_INTERACT;
 	input_dev->id.product = interact_type[i].id;
 	input_dev->id.version = 0x0100;
+	input_dev->dev.parent = &gameport->dev;
 
 	input_set_drvdata(input_dev, interact);