USB: cdc-wdm: kill the now unnecessary bMaxPacketSize0 field and udev variable

We don't need bMaxPacketSize0, and keeping all these different size fields
around will only cause us to use the wrong one.

Seems the udev variable was only used for getting bMaxPacketSize0.  We
could have used it for the usb_fill_*_urb() calls, but as it wasn't
before - why start now?  Instead make the interface_to_usbdev()
calls consistent.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/class/cdc-wdm.c

@@ -80,7 +80,6 @@ struct wdm_device {
 	u16			bufsize;
 	u16			wMaxCommand;
 	u16			wMaxPacketSize;
-	u16			bMaxPacketSize0;
 	__le16			inum;
 	int			reslength;
 	int			length;
@@ -597,7 +596,6 @@ static void wdm_rxwork(struct work_struct *work)
 static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
 	int rv = -EINVAL;
-	struct usb_device *udev = interface_to_usbdev(intf);
 	struct wdm_device *desc;
 	struct usb_host_interface *iface;
 	struct usb_endpoint_descriptor *ep;
@@ -657,7 +655,6 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		goto err;
 
 	desc->wMaxPacketSize = usb_endpoint_maxp(ep);
-	desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
 
 	desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 	if (!desc->orq)
@@ -709,7 +706,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
 
 	usb_fill_control_urb(
 		desc->response,
-		interface_to_usbdev(desc->intf),
+		interface_to_usbdev(intf),
 		/* using common endpoint 0 */
 		usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
 		(unsigned char *)desc->irq,