bpo-36854: Fix reference counter in PyInit__testcapi() (GH-17338)

bpo-36854: Fix reference counter in PyInit__testcapi() (GH-17338) · python/cpython@84c36c1

Original file line number	Diff line number	Diff line change
`@@ -6283,11 +6283,14 @@ PyInit__testcapi(void)`
`6283`	`6283`	`PyModule_AddObject(m, "instancemethod", (PyObject *)&PyInstanceMethod_Type);`
`6284`	`6284`
`6285`	`6285`	`PyModule_AddIntConstant(m, "the_number_three", 3);`
	`6286`	`+PyObject *v;`
`6286`	`6287`	`#ifdef WITH_PYMALLOC`
`6287`		`-PyModule_AddObject(m, "WITH_PYMALLOC", Py_True);`
	`6288`	`+v = Py_True;`
`6288`	`6289`	`#else`
`6289`		`-PyModule_AddObject(m, "WITH_PYMALLOC", Py_False);`
	`6290`	`+v = Py_False;`
`6290`	`6291`	`#endif`
	`6292`	`+Py_INCREF(v);`
	`6293`	`+PyModule_AddObject(m, "WITH_PYMALLOC", v);`
`6291`	`6294`
`6292`	`6295`	`TestError = PyErr_NewException("_testcapi.error", NULL, NULL);`
`6293`	`6296`	`Py_INCREF(TestError);`