usb: zap pdev from usbport

It isn't needed any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/hw/usb-hub.c b/hw/usb-hub.c
index 387c40c..78698ca 100644
--- a/hw/usb-hub.c
+++ b/hw/usb-hub.c
@@ -536,7 +536,7 @@
     for (i = 0; i < NUM_PORTS; i++) {
         port = &s->ports[i];
         usb_register_port(usb_bus_from_device(dev),
-                          &port->port, s, i, &s->dev, &usb_hub_port_ops,
+                          &port->port, s, i, &usb_hub_port_ops,
                           USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);
         port->wPortStatus = PORT_STAT_POWER;
         port->wPortChange = 0;