do not generate 0 as random 64-bit guid
ds_guid of 0 is special, as it is used by snapshot receive code to differentiate between an incremental and full stream. Be sure not to generate guid equal to 0.
This was reported by one of FreeBSD users who really experienced a generated 64-bit guid with value of 0.
Patch author is:
Pawel Jakub Dawidek <pjd@FreeBSD.org>
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