Reuse us_per_second in delta_total_seconds.

Modules/_datetimemodule.c

@@ -2252,22 +2252,14 @@ delta_total_seconds(PyObject *self)
 {
     PyObject *total_seconds;
     PyObject *total_microseconds;
-    PyObject *one_million;
 
     total_microseconds = delta_to_microseconds((PyDateTime_Delta *)self);
     if (total_microseconds == NULL)
         return NULL;
 
-    one_million = PyLong_FromLong(1000000L);
-    if (one_million == NULL) {
-        Py_DECREF(total_microseconds);
-        return NULL;
-    }
-
-    total_seconds = PyNumber_TrueDivide(total_microseconds, one_million);
+    total_seconds = PyNumber_TrueDivide(total_microseconds, us_per_second);
 
     Py_DECREF(total_microseconds);
-    Py_DECREF(one_million);
     return total_seconds;
 }