[media] dvb_usb_v2: return the download ret in dvb_usb_download_firmware

The first being this patch, no return value from dvb_usb_download_firmware
causes system wide dead lock with COLD disconnect as system attempts to continue
to warm state.
Signed-off-by: NMalcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dvb_usb_init.c

@@ -62,7 +62,7 @@ static int dvb_usbv2_download_firmware(struct dvb_usb_device *d)
 	if (ret < 0)
 		goto err;
 
-	return 0;
+	return ret;
 err:
 	pr_debug("%s: failed=%d\n", __func__, ret);
 	return ret;