Remove 1 sec delay.

sdr/uhd_io.cpp

@@ -241,7 +241,7 @@ int main(int /*argc*/, char * /*argv*/[])
 					[&]()->void
 					{
 						try{
-							::sleep(1);
+							//::sleep(1);
 							while (1) {
 								if (stop_signal_called) break;
 								std::vector<float> tx_data;