Kill some TODOs
Kill some TODOs

We already don't check the return value of the update ioctl.
If investigation on that front is really needed,
strace -e=ioctl is much better suited to the task.

NiLuJe/koreader-base,Hzj-jie/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,houqp/koreader-base,NiLuJe/koreader-base,apletnev/koreader-base,Hzj-jie/koreader-base,apletnev/koreader-base,frankyifei/koreader-base,frankyifei/koreader-base,koreader/koreader-base,koreader/koreader-base,apletnev/koreader-base,Hzj-jie/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,frankyifei/koreader-base,frankyifei/koreader-base,houqp/koreader-base,Frenzie/koreader-base,houqp/koreader-base,houqp/koreader-base,koreader/koreader-base,apletnev/koreader-base,Frenzie/koreader-base,koreader/koreader-base,Hzj-jie/koreader-base