usb: set type for error code constants.
usb: set type for error code constants.

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