redefine types and decrement ref

Author: azkrishpy

source/module.c

@@ -89,8 +89,9 @@ static int s_py_logger_log(
         thread_name_str ? PyUnicode_FromString(aws_string_c_str(thread_name_str)) : Py_NewRef(Py_None);
 
     PyObject *result = PyObject_CallFunction(
-        impl->callback, "(is#iss)", (int)log_level, buf, (Py_ssize_t)len, (int)subject, subject_name, py_thread_name);
+        impl->callback, "(is#isO)", (int)log_level, buf, (Py_ssize_t)len, (int)subject, subject_name, py_thread_name);
     Py_XDECREF(result);
+    Py_DECREF(py_thread_name);
     if (PyErr_Occurred()) {
         PyErr_WriteUnraisable(PyErr_Occurred());
         PyGILState_Release(state);