Windows: buf_Recycle should clean up flags and reset version

Windows: buf_Recycle should clean up flags and reset version

The CM_BUF_EOF and CM_BUF_ERROR buffer flags and the
buffer dataVersion should be reset within buf_Recycle()
instead of by the caller of buf_Recycle().

LICENSE MIT

Change-Id: I643da102553200b20f5ecc23ec43974581663a8e
Reviewed-on: http://gerrit.openafs.org/1085
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Asanka Herath <asanka@secure-endpoints.com>
Tested-by: Asanka Herath <asanka@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>