RFsim: Disable beam API if beam simulation is disabled

radio/rfsimulator/simulator.cpp

@@ -1553,9 +1553,11 @@ extern "C" __attribute__((__visibility__("default"))) int device_init(openair0_d
   device->trx_set_freq_func = rfsimulator_set_freq;
   device->trx_set_gains_func = rfsimulator_set_gains;
   device->trx_write_func = rfsimulator_write;
-  device->trx_write_beams_func = rfsimulator_write_beams;
   device->trx_read_func = rfsimulator_read;
-  device->trx_read_beams_func = rfsimulator_read_beams;
+  if (rfsimulator->beam_ctrl->enable_beams) {
+    device->trx_write_beams_func = rfsimulator_write_beams;
+    device->trx_read_beams_func = rfsimulator_read_beams;
+  }
   /* let's pretend to be a b2x0 */
   device->type = RFSIMULATOR;
   openair0_cfg[0].rx_gain[0] = 0;