[PATCH] reject a tdb with hash size of 0

[Andrew Bartlett]

This just ensures we reject (rather than div-by-0) a DB with a zero
hash size.

This was one of the first issues I found that lead to the offset bugs
seen here:
https://bugzilla.samba.org/show_bug.cgi?id=11603

Please review/push.

Thanks,

Andrew Bartlett

-- 
Andrew Bartlett
https://samba.org/~abartlet/
Authentication Developer, Samba Team         https://samba.org
Samba Development and Support, Catalyst IT   
https://catalyst.net.nz/services/samba





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