[issue35636] remove redundant check in unicode_hash(PyObject *self)

[Ma Lin]

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

One scene is caching regular expresses, b'[a-z]', '[a-z]' may exist in the same dict. Any way, it's trivial on the whole.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35636>
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