Fix closing order of FD-MIXIN instances.
Fix closing order of FD-MIXIN instances.

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