sync before killing nickel
sync before killing nickel

Hopefully good enough to avoid trashing the DB

NiLuJe/koreader,frankyifei/koreader,houqp/koreader,koreader/koreader,noname007/koreader,Markismus/koreader,robert00s/koreader,ashang/koreader,Hzj-jie/koreader,pazos/koreader,mihailim/koreader,ashhher3/koreader,lgeek/koreader,chrox/koreader,mwoz123/koreader,Frenzie/koreader,NiLuJe/koreader,apletnev/koreader,poire-z/koreader,koreader/koreader,poire-z/koreader,chihyang/koreader,NickSavage/koreader,Frenzie/koreader