Fix crash on exit on Kobo devices with no frontlight (#3221)
Fix crash on exit on Kobo devices with no frontlight (#3221)


mwoz123/koreader,apletnev/koreader,poire-z/koreader,Frenzie/koreader,NiLuJe/koreader,poire-z/koreader,Frenzie/koreader,koreader/koreader,Hzj-jie/koreader,pazos/koreader,lgeek/koreader,Markismus/koreader,mihailim/koreader,koreader/koreader,NiLuJe/koreader,houqp/koreader