Fix hanging API calls when requesting audio stream
Fix hanging API calls when requesting audio stream

STDIN was left open when forking gstreamer. Closing prevents
control of the socket passing to the GST instance and holding it
open, thereby blocking the API call from returning.

james-johns/XNOR-ESD,james-johns/XNOR-ESD,james-johns/XNOR-ESD,james-johns/XNOR-ESD,james-johns/XNOR-ESD