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index: don't add 1 to length variables

Authored by martinvonz.

Description

index: don't add 1 to length variables

A lot of "+ 1" and "-1" were mechanically added to ease the transition
in 781b2720d2ac (index: don't include nullid in len(),
2018-07-20). Let's clean it up now.

Differential Revision: https://phab.mercurial-scm.org/D4106

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