[vpr][route] print net num in log msg

Author: amin1377

vpr/src/route/connection_router.cpp

@@ -147,7 +147,7 @@ std::tuple<bool, bool, t_heap> ConnectionRouter<Heap>::timing_driven_route_conne
     if (cheapest == nullptr) {
         //Found no path, that may be due to an unlucky choice of existing route tree sub-set,
         //try again with the full route tree to be sure this is not an artifact of high-fanout routing
-        VTR_LOG_WARN("No routing path found in high-fanout mode for net connection (to sink_rr %d), retrying with full route tree\n", sink_node);
+        VTR_LOG_WARN("No routing path found in high-fanout mode for net %zu connection (to sink_rr %d), retrying with full route tree\n", size_t(conn_params.net_id_), sink_node);
 
         //Reset any previously recorded node costs so timing_driven_route_connection()
         //starts over from scratch.