tools/atrf-gpio/atusb.c (gpio): _exit after USB error, to avoid futile cleanup
tools/atrf-gpio/atusb.c (gpio): _exit after USB error, to avoid futile cleanup

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