fix reraising of exception (Issue #259)

Author: spaceone

src/saml2/entity.py

@@ -1062,7 +1062,7 @@ def _parse_response(self, xmlstr, response_cls, service, binding,
             except Exception as err:
                 if "not well-formed" in "%s" % err:
                     logger.error("Not well-formed XML")
-                    raise
+                raise
 
             logger.debug("XMLSTR: %s", xmlstr)