Fix incorrect error handling in _pickle.Unpickler.__init__() (GH-9630)


_pickle.Unpickler.__init__() should return -1 if Pdata_New() fails, not 1.
(cherry picked from commit 4b430e5f6954ef4b248e95bfb4087635dcdefc6d)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
1 file changed