Update for new write interface.
Update for new write interface.

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