Windows: fix condition calls to osi_Log

Windows: fix condition calls to osi_Log

The osi_Log macro is if(foo) osi_AddLog()

If osi_Log macros will be conditionally called, the conditonal
needs to have bracing.

Reviewed-on: http://gerrit.openafs.org/5160
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 4e42d6fd18097d0c8d2e4b455d3c540743d7dbda)

Change-Id: Ic8063144a5069736c95a57965a28d6a101749b3e
Reviewed-on: http://gerrit.openafs.org/6794
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>