py: Downcase MP_xxx_SLOT_IS_FILLED inline functions.
diff --git a/py/builtinhelp.c b/py/builtinhelp.c
index 3b0ad71..a7fede0 100644
--- a/py/builtinhelp.c
+++ b/py/builtinhelp.c
@@ -58,7 +58,7 @@
 #if MICROPY_PY_BUILTINS_HELP_MODULES
 STATIC void mp_help_add_from_map(mp_obj_t list, const mp_map_t *map) {
     for (size_t i = 0; i < map->alloc; i++) {
-        if (MP_MAP_SLOT_IS_FILLED(map, i)) {
+        if (mp_map_slot_is_filled(map, i)) {
             mp_obj_list_append(list, map->table[i].key);
         }
     }