[PATCH] Fixes for winbindd

[Garming Sam]

Hi,

During an auto-build, we managed to come across a segfault in winbindd 
as a result of an RODC DNS update.

We have to ensure that the dns_names parameter is preserved on a long 
term memory context.

The second patch fixes a use after free error when the first error happens.


Please review and push.


Cheers,


Garming Sam
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