[3.9] closes bpo-41533: Fix a potential memory leak when allocating a stack (GH-21847)#22014

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miss-islington wants to merge 1 commit intopython:3.9from

miss-islington:backport-75c80b0-3.9

Commits on Aug 30, 2020

closes bpo-41533: Fix a potential memory leak when allocating a stack (GH-21847)

tontinton
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miss-islington
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