This seems to stop consumers that are doing quick back to back stop/start
(eg gqrx changing decode mode / filter bandwidth) from hanging the
device.
I now don't have any weird hangs on hackrf with gqrx/freebsd/libusb!
When things hang it isn't erroring out in any way; it just doesn't
start receive. It doesn't look like a libusb issue; I'd have to get
some USB bus sniffing to see what's going on behind the scenes.
b4ea51a36b