index: don't add 1 to length variables...
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
