viced: avoid bogus handle in rename

viced: avoid bogus handle in rename

because fileptr's handle can be reset during CopyOnWrite
we need to SetDirHandle after that call

FIXES 130215

Reviewed-on: http://gerrit.openafs.org/5818
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit a1669f3e37299c11bf29a458212e03d1bdb22334)

Change-Id: I57e084102048916b04e45aa32792dc91193e43d8
Reviewed-on: http://gerrit.openafs.org/6081
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>