Fix utf8 encoding error by changing the Python parameter to a bytes() object (python3 regression).
diff --git a/controller.c b/controller.c
index 982bceb..db85c23 100644
--- a/controller.c
+++ b/controller.c
@@ -386,7 +386,7 @@
 	Py_XINCREF(py_instance);
 
 	if (!(py_res = PyObject_CallMethod(py_instance, "decode",
-			"KKs#", timeoffset, duration, inbuf, inbuflen))) {
+			"KKy#", timeoffset, duration, inbuf, inbuflen))) {
 		if (PyErr_Occurred())
 			PyErr_Print(); /* Returns void. */