[geeklog-hg] [Geeklog-Core/geeklog] 591cc6: Fixed errors with PHP 8.0.0

[Kenji ITO]

  Branch: refs/heads/master
  Home:   https://github.com/Geeklog-Core/geeklog
  Commit: 591cc65f3338f031d95ba15b4e6cd155c8f35b23
      https://github.com/Geeklog-Core/geeklog/commit/591cc65f3338f031d95ba15b4e6cd155c8f35b23
  Author: mystralkk <mystralkk at gmail.com>
  Date:   2020-12-20 (Sun, 20 Dec 2020)

  Changed paths:
    M system/classes/Cache/FileSystem.php

  Log Message:
  -----------
  Fixed errors with PHP 8.0.0