Windows: fix buf_Recycle() comment

Windows: fix buf_Recycle() comment

buf_Recycle() does not return with a reference count to the
cm_buf_t object held.  Correct the comment.

Reviewed-on: http://gerrit.openafs.org/6173
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
(cherry picked from commit 7dccf17840a53e96b21f8c092910f3e4d7628b71)

Change-Id: I0890439df967f8b2a87d5079adcd71a646500876
Reviewed-on: http://gerrit.openafs.org/6812
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>