Fixed warnings

bitpacking/BitPacker.h

@@ -353,7 +353,7 @@ class BitPacker {
            and value to be written in the packet and check some conditions */
         template<typename T>
         bool checkParameters(int pos,  int num, T val) {
-
+            (void)val; // Avoid unused warning
             // check that T is a numerical type
             static_assert(std::is_arithmetic<T>::value, "The specified value is not a number (T must be an arithmetic type)");
             // check that T is uintX_t