[issue32013] _pickle: Py_DECREF seems to be missing from a failure case in fast_save_enter()

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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pull_requests: +4333

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32013>
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