Plug a memory leak in Py_InitModule4():  when PyDict_SetItemString() failed, the object being inserted was not being DECREFed.
Plug a memory leak in Py_InitModule4():  when PyDict_SetItemString() failed,
the object being inserted was not being DECREFed.

This closes SF bug #444486.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator