Clear streaming flag if we didn't resubmit a transfer.

If result < 0 here, libusb_submit_transfer returned an error, so we
need to shut down.

If !resubmit, then cancel_transfers() was already called by one of the
stop or close functions, so streaming is already false.

host/libhackrf/src/hackrf.c

@@ -1754,6 +1754,7 @@ static void LIBUSB_CALL hackrf_libusb_transfer_callback(struct libusb_transfer*
 
 			if (!resubmit || result < 0) {
 				transfer_finished(device, usb_transfer);
+				device->streaming = false;
 			}
 		} else {
 			transfer_finished(device, usb_transfer);