Remove useless check in MAYBE-REWIND-IOBUF.
Remove useless check in MAYBE-REWIND-IOBUF.

deadtrickster/iolib,shamazmazum/iolib,lispnik/iolib,attila-lendvai/iolib,lispnik/iolib,tiago4orion/iolib,sionescu/iolib,sionescu/iolib,dkochmanski/iolib,deadtrickster/iolib,lispnik/iolib,attila-lendvai/iolib,sionescu/iolib,attila-lendvai/iolib,tiago4orion/iolib,dkochmanski/iolib,tiago4orion/iolib,shamazmazum/iolib,deadtrickster/iolib,shamazmazum/iolib,dkochmanski/iolib