[issue35696] remove unnecessary operation in long_compare()

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

> I'd fix them, but I'm not sure if we are going to restore CHECK_SMALL_INT() ¯\_(ツ)_/¯

I suggest we slow down, carefully sort out the recent commits for longobject.c:
https://bugs.python.org/issue37812#msg352837

Make the code has consistent style, better readability...

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