ide: remove BUG_ON() from ide_build_sglist()

do_rw_taskfile() has been fixed to check the return value
of ->dma_setup method so this BUG_ON() is no longer needed.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-dma.c

@@ -186,8 +186,6 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
 	ide_hwif_t *hwif = HWIF(drive);
 	struct scatterlist *sg = hwif->sg_table;
 
-	BUG_ON((rq->cmd_type == REQ_TYPE_ATA_TASKFILE) && rq->nr_sectors > 256);
-
 	ide_map_sg(drive, rq);
 
 	if (rq_data_dir(rq) == READ)