We shouldn't ever get there if drive is busy and we can't start transfer
in this case.  ide-disk.c:read_intr() also doesn't check for BUSY_STAT bit.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>