ide-cd: remove BUG_ON() from cdrom_newpc_intr()

There is no need for it anylonger and ide_set_handler() complains
if ->handler is not NULL anyway.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-cd.c

@@ -1397,8 +1397,6 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 	if (len > 0)
 		ide_cd_pad_transfer(drive, xferfunc, len);
 
-	BUG_ON(HWGROUP(drive)->handler != NULL);
-
 	ide_set_handler(drive, cdrom_newpc_intr, rq->timeout, NULL);
 	return ide_started;
 }