Windows: Be more conservative about checking error conditions

Windows: Be more conservative about checking error conditions

It has been reported that winlogon.exe is crashing on some
systems.  The reports indicate that the failure is somewhere
in GetLogonDomainOptions.  This commit ensures that we are
more conservative about the assumptions that are made regarding
which Lsa operations can fail.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/321
Reviewed-by: Asanka Herath <asanka@secure-endpoints.com>
Tested-by: Asanka Herath <asanka@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>