patch for missing ads_destroy calls in net_ads_join

[Gerald (Jerry) Carter]

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Michael Adam wrote:
> Hi,
> 
> this is a patch that fixes a couple of missing ads_destroy
> calls in utils/net_ads.c:net_ads_join.

Applying to SAMBA_3_0 and SAMBA_3_0_23 now.  The only thing
I changed was initialization to ensure that "ADS_STRUCT *ads = NULL"
so that if we call ads_destroy() on an error path before
we have called ads_startup(), we will exit without trying
to free invalid memory.




cheers, jerry

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