namei: Remove extraneous rmdir

namei: Remove extraneous rmdir

We just unlinked the file, so we know we won't be able to rmdir() the
same thing. Give a path one level higher to
namei_RemoveDataDirectories, so we start rmdir()ing at the parent dir.

Reviewed-on: http://gerrit.openafs.org/5833
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit b41e30a55c8aeb6d7f42d74f9eb090232032057f)

Change-Id: Ibd14490e2d85bd78522472203ad57120237bff22
Reviewed-on: http://gerrit.openafs.org/6079
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>