ide-disk: fix issues found by checkpatch.pl

There are no changes to the resulting drivers/ide/ide-disk.o binary file
(md5sum-s after and before the patch match).

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>