Fix refleak.

Author: ericsnowcurrently

Modules/_datetimemodule.c

@@ -7167,12 +7167,11 @@ _datetime_exec(PyObject *module)
      * values. This may change in the future.*/
 
     /* -23:59 */
-    PyObject *min = create_timezone_from_delta(-1, 60, 0, 1);
-    DATETIME_ADD_MACRO(d, "min", min);
+    DATETIME_ADD_MACRO(d, "min", create_timezone_from_delta(-1, 60, 0, 1));
 
     /* +23:59 */
-    PyObject *max = create_timezone_from_delta(0, (23 * 60 + 59) * 60, 0, 0);
-    DATETIME_ADD_MACRO(d, "max", max);
+    DATETIME_ADD_MACRO(
+            d, "max", create_timezone_from_delta(0, (23 * 60 + 59) * 60, 0, 0));
 
 #undef DATETIME_ADD_MACRO