Make CLOSE of SELECT-MULTIPLEXERs double-free-safe.
Make CLOSE of SELECT-MULTIPLEXERs double-free-safe.

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