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

[Serhiy Storchaka]

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


----------
versions:  -Python 3.6, Python 3.7

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