added suppress_stdout to radio::init_multi

lib/src/radio/radio_multi.cc

@@ -16,6 +16,8 @@ bool radio_multi::init_multi(uint32_t nof_rx_antennas, char* args, char* devname
   cur_tx_srate = 0; 
   is_start_of_burst = true;
 
+  // Suppress radio stdout
+  srslte_rf_suppress_stdout(&rf_device);
 
   tx_adv_auto = true; 
   // Set default preamble length each known device