silence warning due to time being returned as an int

src/storm-pomdp/generator/NondeterministicBeliefTracker.cpp

@@ -410,7 +410,7 @@ namespace storm {
             storm::utility::Stopwatch trackTimer(true);
             for (auto const& belief : beliefs) {
                 belief.update(newObservation, newBeliefs);
-                if (options.trackTimeOut > 0 && trackTimer.getTimeInMilliseconds() > options.trackTimeOut) {
+                if (options.trackTimeOut > 0 && static_cast<uint64_t>(trackTimer.getTimeInMilliseconds()) > options.trackTimeOut) {
                     return false;
                 }
             }