[PATCH] Bug in get_dc_name_via_netlogon() in winbindd_cm.c

[boyang]

Hi, everybody:
     We can rely in the werr status return from
rpccli_netr_DsRGetDCName(). please have a look at
rpccli_netr_DsRGetDCName(), if it fails, status is set. But *info is not
set and werr is not set too. we can reference to null pointer *info
after the call rpccli_netr_DsRGetDCName(). This only happens when
rpccli_netr_DsRGetDCName() fails, and werr is originally 0, in which
case info = NULL; :-)
    patch for master in the attachment, please review it.
    Thanks!

Best
        Regards
BoYang
14th, Jan
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