readdir() doesn't always return . and .. entries at first and in that order.
This leads to not creating them at first in the directory, which raises some
errors on file system checking utilities like MS-DOS Scandisk.

Specification: "FAT: General overview of on-disk format" v1.03, page 25

Fixes: https://bugs.launchpad.net/qemu/+bug/1599539Signed-off-by: NHervé Poussineau <hpoussin@reactos.org>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>