Fix some reference counting bugs in the SWIG Python bindings.

* subversion/bindings/swig/python/libsvn_swig_py/swigutil_py.c
  (svn_swig_py_propinheriteditemarray_to_dict,
   svn_swig_py_proparray_to_dict,
   svn_swig_py_locationhash_to_dict): Add missing Py_DECREF.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1464899 13f79535-47bb-0310-9956-ffa450edef68