Windows: AFSInitializeProcessCB failure stack exhaustion

Windows: AFSInitializeProcessCB failure stack exhaustion

If AFSInitializeProcessCB() fails in AFSProcessCreate() it can
lead to a recursive loop of AFSValidateProcessEntry() ->
AFSProcessCreate() calls.  Only call AFSValidateProcessEntry()
if AFSInitializeProcessCB() succeeds.  On failure, log an error
to the trace log.

Change-Id: I67a65bed9a3193a5ce44eb01d30aed15fe9e469d
Reviewed-on: http://gerrit.openafs.org/7309
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>