[issue37812] Make implicit returns explicit in longobject.c (in CHECK_SMALL_INT)

[Ma Lin]

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

> I agree that both changes should be reverted.

There is another commit after the two commits:
https://github.com/python/cpython/commit/c6734ee7c55add5fdc2c821729ed5f67e237a096

It is troublesome to revert them.

PR 16146 is on-going, maybe we can request the author to replace `Py_UNREACHABLE()` with `assert(0)`.

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