bpo-37547: add _PyObject_CallMethodOneArg (GH-14685)

diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 052ed88..4de6787 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -1776,7 +1776,7 @@
     if (str == NULL)
         return -1;
 
-    wr = _PyObject_CallMethodIdObjArgs(self->stream, &PyId_write, str, NULL);
+    wr = _PyObject_CallMethodIdOneArg(self->stream, &PyId_write, str);
     Py_DECREF(str);
     if (wr == NULL)
         return -1;
@@ -1870,7 +1870,7 @@
     if (PyBytes_Size(pwrt) > 0) {
         PyObject *wr;
 
-        wr = _PyObject_CallMethodIdObjArgs(self->stream, &PyId_write, pwrt);
+        wr = _PyObject_CallMethodIdOneArg(self->stream, &PyId_write, pwrt);
         if (wr == NULL) {
             Py_DECREF(pwrt);
             return NULL;