Modify nr_dlsim, nr_pbchsim and nr_pucchsim to return '0' on success

- Change return value of nr_dlsim, nr_pbchsim and nr_pucchsim to:
  - Return '0' if test succeeds (indicated also by "PDSCH/PBCH/PUCCH test
    OK" in the test log).
  - Return '1' if test fails.

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -943,8 +943,7 @@ printf("%d\n", slot);
 
   nr_ue_phy_config_request(&UE_mac->phy_config);
   //NR_COMMON_channels_t *cc = RC.nrmac[0]->common_channels;
-  int n_errs = 0;
-
+  int ret = 1;
   initNamedTpool(gNBthreads, &gNB->threadPool, true, "gNB-tpool");
   initNotifiedFIFO(&gNB->L1_tx_free);
   initNotifiedFIFO(&gNB->L1_tx_filled);
@@ -1371,10 +1370,10 @@ printf("%d\n", slot);
 
     if (effRate > (eff_tp_check*TBS)) {
       printf("PDSCH test OK\n");
+      ret = 0;
       break;
     }
 
-    n_errs = n_errors[0];
   } // NSR
 
   free(Sched_INFO);
@@ -1423,7 +1422,7 @@ printf("%d\n", slot);
     free(filename_csv);
   }
 
-  return n_errs;
+  return ret;
 }