[media] usbtv: fix leak at failure path in usbtv_probe()

Error handling code in usbtv_probe() misses usb_put_dev().

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: NAlexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: NLubomir Rintel <lkundrak@v3.sk>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/usbtv/usbtv-core.c

@@ -91,6 +91,8 @@ static int usbtv_probe(struct usb_interface *intf,
 	return 0;
 
 usbtv_video_fail:
+	usb_set_intfdata(intf, NULL);
+	usb_put_dev(usbtv->udev);
 	kfree(usbtv);
 
 	return ret;