Compiler warnings in ubsan builds

tiran

BPO	40998
Nosy	@vstinner, @ericvsmith, @tiran, @ericsnowcurrently, @miss-islington
PRs	bpo-40998: Address compiler warnings found by ubsan #20929 bpo-40998: Fix a refleak in create_filter() #23365 [3.9] bpo-40998: Fix a refleak in create_filter() (GH-23365) #23369 [3.9] bpo-40998: Address compiler warnings found by ubsan (GH-20929) #23370

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-06-17.07:00:21.597>
labels = ['build', '3.9', '3.10']
title = 'Compiler warnings in ubsan builds'
updated_at = <Date 2020-11-18.17:45:56.990>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2020-11-18.17:45:56.990>
actor = 'miss-islington'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2020-06-17.07:00:21.597>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 40998
keywords = ['patch']
message_count = 11.0
messages = ['371712', '371713', '381332', '381334', '381335', '381336', '381338', '381349', '381353', '381354', '381362']
nosy_count = 5.0
nosy_names = ['vstinner', 'eric.smith', 'christian.heimes', 'eric.snow', 'miss-islington']
pr_nums = ['20929', '23365', '23369', '23370']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue40998'
versions = ['Python 3.9', 'Python 3.10']