Use same next method to make cleaner than increment operator.

src/GroovePlayer.cpp

@@ -295,12 +295,12 @@ void GroovePlayerMgr::grooveEventLoop()
                     else if(pick <= 9)
                     {
                         //Second track wins.
-                        winner = (*currentVoteBatch.begin()++);
+                        winner = (*std::next(currentVoteBatch.begin(),1));
                     }
                     else
                     {
                         //Third track wins
-                        winner = (*(currentVoteBatch.begin()++)++);
+                        winner = (*std::next(currentVoteBatch.begin(),2));
                     }
                 }
             }