ccgx: Do not add zero sized DMC records
ccgx: Do not add zero sized DMC records

This prevents a DoS when parsing corrupt firmware.

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