Use stop instead of stop_.

[bdice]

Small fix to inconsistent variable names in tests, following up from #9571.

Previous conversation: #9571 (comment)

[codecov]

Codecov Report

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@@               Coverage Diff               @@
##             branch-22.02    #9735   +/-   ##
===============================================
  Coverage                ?   10.49%           
===============================================
  Files                   ?      119           
  Lines                   ?    20305           
  Branches                ?        0           
===============================================
  Hits                    ?     2130           
  Misses                  ?    18175           
  Partials                ?        0           

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[bdice]

@gpucibot merge