[3.9] bpo-40998: Fix a refleak in create_filter() (GH-23365)#23369

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miss-islington merged 1 commit intopython:3.9from

tiran:backport-d1e38d4-3.9

Nov 18, 2020

Commits on Nov 18, 2020

[3.9] bpo-40998: Fix a refleak in create_filter() (GH-23365). (cherry picked from commit d1e38d4023aa29e7ed64d4f8eb9c1e4a3c86a2e5)

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