Fix a typo/cut-n-paste error in DBCursor.join_item so that it doesn't

return a tuple.  (this also implies that nobody uses this method; the
bug has been here for a long time)

Modules/_bsddb.c

@@ -3033,7 +3033,7 @@ DBC_join_item(DBCursorObject* self, PyObject* args)
         retval = NULL;
     }
     else {
-        retval = Py_BuildValue("s#s#", key.data, key.size);
+        retval = Py_BuildValue("s#", key.data, key.size);
         FREE_DBT(key);
     }