Nico Weber f956cd6e6a LibPDF: Fix an off-by-one in computing_a_hash_r6_and_later() ...

With this, `pdf` can print info for CIPA_DC-003-2020_E.pdf
(from https://cipa.jp/e/std/std-sec.html), as well as all other
files I've tried.

CIPA_DC-003-2020_E.pdf is special because it quits this loop after
exactly 64 interations, at round_number 63.

While here, also update a comment to use the non-spec-comment style
I'm now using elsewhere in the file.

2023-07-21 11:55:20 +02:00

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