Remove useless argument of _PyUnicode_AsDefaultEncodedString()
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index ff35862..d30018b 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -1826,7 +1826,7 @@
         return NULL;
     }
     if (PyUnicode_Check(proto)) {
-        PyObject *v = _PyUnicode_AsDefaultEncodedString(proto, NULL);
+        PyObject *v = _PyUnicode_AsDefaultEncodedString(proto);
         if (!v)
             goto error;
         proto_str = PyBytes_AS_STRING(v);
diff --git a/Modules/_dbmmodule.c b/Modules/_dbmmodule.c
index 827acce..69a7112 100644
--- a/Modules/_dbmmodule.c
+++ b/Modules/_dbmmodule.c
@@ -219,7 +219,7 @@
          return -1;
     }
     if (PyUnicode_Check(arg)) {
-        arg = _PyUnicode_AsDefaultEncodedString(arg, NULL);
+        arg = _PyUnicode_AsDefaultEncodedString(arg);
         if (arg == NULL)
             return -1;
     }