staging: ozwpan: fix access byteorder for wMaxPacketSize in ozhcd.c

This patch fixes the access byteorder of wMaxPacketSize
which is __le16, following the USB standard, and needs to
be converted into native cpu byteorder in order to be accessed.

Instead of using le16_to_cpu(hep->desc.wMaxPacketSize),
it was used the usb_endpoint_maxp() function, defined in
<uapi/linux/usb/ch9.h>

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ozwpan/ozhcd.c

@@ -1243,7 +1243,7 @@ static int oz_build_endpoints_for_interface(struct usb_hcd *hcd,
 		if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
 			== USB_ENDPOINT_XFER_ISOC) {
 			oz_trace("wMaxPacketSize = %d\n",
-				hep->desc.wMaxPacketSize);
+				usb_endpoint_maxp(&hep->desc));
 			ep->credit_ceiling = 200;
 			if (ep_addr & USB_ENDPOINT_DIR_MASK) {
 				ep->flags |= OZ_F_EP_BUFFERING;