This fixes a couple of CONFIG_IDE_TASKFILE_IO=n issues:
 - check status after last sector for PIO-in transfers
 - handle drive->unmask properly in PIO-out prehandlers
 - use rq->[hard]_nr_sectors where appropriate
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>