Avoid calling missing _PyObject_MakeTpCall function

Author: msimacek

graalpython/com.oracle.graal.python.cext/src/object.c

@@ -226,7 +226,7 @@ PyObject* PyObject_CallFunction(PyObject* callable, const char* fmt, ...) {
     PyObject* args;
 
     if (fmt == NULL || fmt[0] == '\0') {
-        return _PyObject_CallNoArg(callable);
+        return PyObject_CallObject(callable, NULL);
     }
 
     CALL_WITH_VARARGS(args, Py_BuildValue, 2, fmt);
@@ -245,7 +245,7 @@ PyObject* _PyObject_CallFunction_SizeT(PyObject* callable, const char* fmt, ...)
     PyObject* args;
 
     if (fmt == NULL || fmt[0] == '\0') {
-        return _PyObject_CallNoArg(callable);
+        return PyObject_CallObject(callable, NULL);
     }
 
     CALL_WITH_VARARGS(args, Py_BuildValue, 2, fmt);

graalpython/com.oracle.graal.python.test/src/tests/cpyext/test_functions.py

@@ -160,10 +160,21 @@ def forgiving_len(o):
         lambda args: args[0](args[2], args[3]),
         lambda: (
             (sum, "Oi", [], 10),
+            (sum, "Oi", [], 10),
         ),
         arguments=["PyObject* callable", "const char* fmt", "PyObject* list", "int initial"],
         argspec="OsOi",
     )
+    test_PyObject_CallFunction0 = CPyExtFunction(
+        lambda args: args[0](),
+        lambda: (
+            (list, ""),
+            (bool, ""),
+        ),
+        arguments=["PyObject* callable", "const char* fmt"],
+        argspec="Os",
+        callfunction="PyObject_CallFunction",
+    )
 
     class MyObject():