The block subsystem uses loff_t to store the device size. Change the
type for nbd_device bytesize to loff_t.
Signed-off-by: NMarkus Pargmann <mpa@pengutronix.de>
Acked-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NJens Axboe <axboe@fb.com>