fix median overflow bug

contrib/epee/include/stats.inl

@@ -1,6 +1,7 @@
 #include <math.h>
 #include <limits>
 #include <algorithm>
+#include "misc_language.h"
 #include "stats.h"
 
 enum
@@ -86,7 +87,7 @@ Tpod Stats<T, Tpod>::get_median() const
     }
     else
     {
-      median = (sorted[(sorted.size() - 1) / 2] + sorted[sorted.size() / 2]) / 2;
+      median = epee::misc_utils::get_mid(sorted[(sorted.size() - 1) / 2], sorted[sorted.size() / 2]);
     }
     set_cached(bit_median);
   }