[issue41117] [easy C] GC: Use local variable 'op' when invoking 'traverse' in 'subtract_refs'

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Thanks William, I made the change that you suggested. Next time, please create a PR directly ;-)

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.11 -Python 3.10

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<https://bugs.python.org/issue41117>
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