Windows: correct log message in buf_Sync()

Windows: correct log message in buf_Sync()

Reviewed-on: http://gerrit.openafs.org/5347
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 20772897654b58da6f7d4cd0bd2caf169abddd50)

Change-Id: I676a919701c4edfbc130a04c94f4092676a1d53c
Reviewed-on: http://gerrit.openafs.org/6025
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>