tools/atrf-rssi/gui.c (gui): accept keyboard input both from stdin and SDL
tools/atrf-rssi/gui.c (gui): accept keyboard input both from stdin and SDL

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan