In function ezusb_probe() at drivers/net/wireless/orinoco/orinoco_usb.c:1561, if alloc_orinocodev() at line 1574 fails, ezusb_probe() will return 0 indicating success, because variable 'retval' is assigned 0 at line 1571. But, function ezusb_probe() should propagate the error and return the error to its caller functions. So, when ezusb_probe() fails, the return value 0 is wrong.
The related code snippets in ezusb_probe are as following.
ezusb_probe @@ drivers/net/wireless/orinoco/orinoco_usb.c:1561
1561 static int ezusb_probe(struct usb_interface *interface,
1562                        const struct usb_device_id *id)
1563 {

                 ....
1571         int retval = 0;
1572         int i;
1573 
1574         priv = alloc_orinocodev(sizeof(*upriv), &udev->dev,
1575                                 ezusb_hard_reset, NULL);
1576         if (!priv) {
1577                 err("Couldn't allocate orinocodev");
1578                 goto exit;
1579         }
                 ...

1712  exit:
1713         if (fw_entry) {
1714                 firmware.code = NULL;
1715                 firmware.size = 0;
1716                 release_firmware(fw_entry);
1717         }
1718         usb_set_intfdata(interface, upriv);
1719         return retval;
1720 }