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/pucchsim.c

@@ -109,6 +109,7 @@ int main(int argc, char **argv)
   //int subframe_offset;
   //char fname[40], vname[40];
   int trial,n_trials=100,n_errors=0,ack_nack_errors=0,sr_errors=0;
+  int ret = 1;
   uint8_t transmission_mode = 1,n_tx=1,n_rx=1;
   uint16_t Nid_cell=0;
   uint64_t SSB_positions=0x01;
@@ -758,6 +759,7 @@ int main(int argc, char **argv)
       printf("ACK/NACK: SNR=%f, n_trials=%d, n_bit_errors=%d\n",SNR,n_trials,ack_nack_errors);
     if((float)(ack_nack_errors+sr_errors)/(float)(n_trials)<=target_error_rate){
       printf("PUCCH test OK\n");
+      ret = 0;
       break;
     }
   }
@@ -799,5 +801,5 @@ int main(int argc, char **argv)
   loader_reset();
   logTerm();
 
-  return(n_errors);
+  return ret;
 }