vol: initialize FdHandle_t stack objects

vol: initialize FdHandle_t stack objects

In namei_create() a temporary FdHandle_t is allocated on
the stack but was never initialized.  Depending on what
prior data was on the stack the FdHandle_t could result
in subsequent operations failing in unpredictable ways.

Reviewed-on: http://gerrit.openafs.org/3667
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 05d5f012e0be9be1c2c82871a75ac76d437b9688)

Change-Id: I44913419e09b36a3581320cd169bbc4774cd0208
Reviewed-on: http://gerrit.openafs.org/3829
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>