Bug in lookupname_recv() in nsswitch/winbindd_async.c in v3-0-stable and v3-0-test, wrong pointer conversion?

[Bo Yang]

Hi, All:
        Is the conversion of the pointer private_data in lookupname_recv() in nsswitch/winbindd_async.c wrong?
        Here is the patch.
        Please help me review it. 
        Please correct me if I am wrong on this.

Thanks!
Best
        Regards

BoYang
1.28
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