Correctly parse DFU interfaces with extra vendor-specific data
Correctly parse DFU interfaces with extra vendor-specific data

Fixes: https://github.com/hughsie/fwupd/issues/1152

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd