Fix compilation error

packet-exchange/src/server.c

@@ -244,6 +244,7 @@ static void print_histograms() {
 
   uint64_t duration;
   int duration_hour, duration_minutes, interval;
+  int max_hist_val, min_hist_val;
 
   clock_gettime(CLOCK_MONOTONIC, &measures_end);
 
@@ -263,7 +264,7 @@ static void print_histograms() {
                 "},"
              "\"props\": [", interval, duration_hour, duration_minutes);
 
-  int max_hist_val = 0;
+  max_hist_val = 0;
   for (int i = 0; i < 2; i++)
     for (int j = 0; j < MAX_HIST_VAL; j++)
       if (histograms[i][j])
@@ -279,7 +280,7 @@ static void print_histograms() {
   max_hist_val = 0;
   for (int j = 0; j < MAX_HIST_VAL && histograms[2][j]; j++)
     max_hist_val = j;
-  min_hist_val = 0;
+  min_hist_val = MAX_HIST_VAL - 1;
   for (int j = MAX_HIST_VAL - 1; j >= 0 && histograms[2][j]; j--)
     min_hist_val = j;