[issue24011] Add error checks to PyInit_signal()

[Joannah Nanjekye]

Joannah Nanjekye <nanjekyejoannah at gmail.com> added the comment:

@berkerpeksag I made the requested changes on the PR. PTAL.

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nosy: +nanjekyejoannah

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24011>
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