unix: Fix casting issue, int to small int object.

unix/modos.c

@@ -53,7 +53,7 @@ STATIC mp_obj_t mod_os_stat(mp_obj_t path_in) {
     t->items[0] = MP_OBJ_NEW_SMALL_INT((machine_int_t)sb.st_mode);
     t->items[1] = MP_OBJ_NEW_SMALL_INT(sb.st_ino);
     t->items[2] = MP_OBJ_NEW_SMALL_INT((machine_int_t)sb.st_dev);
-    t->items[3] = MP_OBJ_NEW_SMALL_INT(sb.st_nlink);
+    t->items[3] = MP_OBJ_NEW_SMALL_INT((machine_int_t)sb.st_nlink);
     t->items[4] = MP_OBJ_NEW_SMALL_INT((machine_int_t)sb.st_uid);
     t->items[5] = MP_OBJ_NEW_SMALL_INT((machine_int_t)sb.st_gid);
     t->items[6] = MP_OBJ_NEW_SMALL_INT(sb.st_size);