mkcephfs: Remove temp dir, not just its contents.
mkcephfs: Remove temp dir, not just its contents.

Also fixes the case where no temp files were created in the dir.

Signed-off-by: Tommi Virtanen <9ab2264cc7e4806727ef3fc8f99e05b759bbf6e0@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph