[PATCHES] add some safeguards in idmap_hash module

[Günther Deschner]

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Hi,

the idmap_hash module can behave pretty badly in more advanced idmap
configurations, add some more safety when using this module.

Resolves https://bugzilla.samba.org/show_bug.cgi?id=11786.

Please review and push,

Thanks,
Guenther

- -- 
Günther Deschner                    GPG-ID: 8EE11688
Red Hat                         gdeschner at redhat.com
Samba Team                              gd at samba.org
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