[issue32568] Fix handling of sizehint=-1 in select.epoll()

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Extension Modules
stage:  -> needs patch
type:  -> behavior
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32568>
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