bc42f462b1
in cases where the supplied name was already pointing to a character special device. This fixes the breakage that occured when trying to dump a filesystem by name (e. g. /usr), with an fstab already mentioning the raw device name (like /dev/rda0g) where dump attempted to use /dev/rrda0g then. Also removed the now obsolete remark that fstab were carrying block special names.