Fix warning reported by LuaCheck (#563)

David Leal

2020-09-05 11f2b4f4b317a25972733e3d3fe9f2dc6ce31c6a

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RealBadAngel <maciej.kasatkin@o2.pl> <mk@realbadangel.pl>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com> <vanessa@rainbird.(none)>
kaeza <kaeza@users.sf.net> Diego Martínez <kaeza@users.sf.net>