Fix segmentation fault

packet-exchange/src/client.c

@@ -258,7 +258,7 @@ static void do_tsn_task(struct thread_param *param, uint64_t next_txtime) {
         fprintf(stderr, "RTT value higher than MAX_HIST_VAL : %d ( > %d)\n", rtt_us, MAX_HIST_VAL);
         exit(EXIT_FAILURE);
       }
-      histograms[0][param->stats.rtt]++;
+      histograms[0][rtt_us]++;
     }
   }
 }