Fix: don't call walk callback with negative increment

[emmercm]

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[github-actions]

🧪 Branch testing instructions

This pull request has been merged, its base branch can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/3.0.0-feature" [commands..] [options]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.68%. Comparing base (dc48b8b) to head (e7773b9).
Report is 1 commits behind head on emmercm/3.0.0-feature.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           emmercm/3.0.0-feature    #1290   +/-   ##
======================================================
  Coverage                  92.67%   92.68%           
======================================================
  Files                        117      117           
  Lines                       7390     7396    +6     
  Branches                    1789     1789           
======================================================
+ Hits                        6849     6855    +6     
  Misses                       518      518           
  Partials                      23       23           

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[github-actions]

🔒 Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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