Fix a gcc warning introduced by r79397.
diff --git a/Modules/datetimemodule.c b/Modules/datetimemodule.c
index 3f1eb57..402dae9 100644
--- a/Modules/datetimemodule.c
+++ b/Modules/datetimemodule.c
@@ -4858,7 +4858,7 @@
 
 	x = PyCapsule_New(&CAPI, PyDateTime_CAPSULE_NAME, NULL);
 	if (x == NULL)
-		return NULL;
+		return;
 	PyModule_AddObject(m, "datetime_CAPI", x);
 
 	/* A 4-year cycle has an extra leap day over what we'd get from