leases_db_del() can crash smbd when there's no record to delete

[Youzhong Yang]

Hi all,

I am proposing a patch fixing the following issue:

https://bugzilla.samba.org/show_bug.cgi?id=12495

In reality, we may never hit it, but it needs to be fixed.

Attached please review the patch.

Thanks,

--Youzhong

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