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wrap_nettle_hash_fast: avoid calling _update with zero-length input

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/nettle-hash into master

As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior.


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Reviewer's checklist:

  • Any issues marked for closing are addressed
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Edited by Alexander Sosedkin

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