Fix small mistakes

packet-exchange/src/send_packet.c

@@ -42,7 +42,7 @@ static void init_tx_buffer(size_t _tx_buffer_len);
 
 static int so_priority = 3;
 static struct sock_txtime sk_txtime;
-static unsigned char *tx_buffer;
+static char *tx_buffer;
 static size_t tx_buffer_len;
 static int sock_fd;
 

packet-exchange/src/server.c

@@ -332,7 +332,7 @@ static void sigint_handler(int sig_num) {
     print_histograms();
 
   if(param->stats.lost_packets)
-    fprintf(stderr, "%d packets were lost\n");
+    fprintf(stderr, "%d packets were lost\n", param->stats.lost_packets);
 
   exit(EXIT_SUCCESS);
 }