Currently much indentation in this file is done with whitespaces instead of
tabs, which can make reading difficult, so fix this up.

Some other little minor tidy-up is done, but this file still has many other
checkpatch warnings (generally linelength > 80 or function arguments have
no identifier names).

All libsas code can be audited for checkpatch issues later.
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>