[PATCH] s3: winbindd: Old NT Domain code sets struct winbind_domain->alt_name to be NULL. Ensure this is safe with modern AD-DCs.

[Jeremy Allison]

Fixes bug #10717 - Winbind crash on losing VPN connection

https://bugzilla.samba.org/show_bug.cgi?id=10717

Confirmed and tested in production by the
submitter (David Woodhouse <dwmw2 at infradead.org>
so he knows what he's doing :-).

Review and push most welcome !

Thanks,

	Jeremy.
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