Replace PyObject_CallFunctionObjArgs() with fastcall

* PyObject_CallFunctionObjArgs(func, NULL) => _PyObject_CallNoArg(func)
* PyObject_CallFunctionObjArgs(func, arg, NULL) => _PyObject_CallArg1(func, arg)

PyObject_CallFunctionObjArgs() allocates 40 bytes on the C stack and requires
extra work to "parse" C arguments to build a C array of PyObject*.

_PyObject_CallNoArg() and _PyObject_CallArg1() are simpler and don't allocate
memory on the C stack.

This change is part of the fastcall project. The change on listsort() is
related to the issue #23507.

1 files changed, 1 insertions, 1 deletions

diff --git a/Modules/_csv.c b/Modules/_csv.c
index e5324ae..08907db 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -1259,7 +1259,7 @@ csv_writerow(WriterObj *self, PyObject *seq)
                                      (void *) self->rec, self->rec_len);
     if (line == NULL)
         return NULL;
-    result = PyObject_CallFunctionObjArgs(self->writeline, line, NULL);
+    result = _PyObject_CallArg1(self->writeline, line);
     Py_DECREF(line);
     return result;
 }