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

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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nosy: +vstinner
nosy_count: 1.0 -> 2.0
pull_requests: +26094
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27593

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41117>
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