a misunderstanding of the refcont behavior of the 'O' format code in
PyArg_ParseTuple() and Py_BuildValue(), respectively.

- pobj is only a borrowed reference, so should *not* be DECREF'ed at
  the end.  This was the cause of SF bug #470635.

- The Py_BuildValue() call would leak the object produced by
  makesockaddr().  (I found this by eyeballing the code.)