Remove some dead code.
Remove some dead code.

wisavalite/go-mtpfs,cmars/tools,wisavalite/go-mtpfs,riwsakiP8/riwsakiza-go-mtpfs,riwsakiP8/riwsakiza-go-mtpfs,FracturedRetina/go-mtpfs,riwsakiP8/riwsakiza-go-mtpfs,cmars/tools,cmars/tools,FracturedRetina/go-mtpfs,FracturedRetina/go-mtpfs,cmars/tools,wisavalite/go-mtpfs