add argument to generic type, remove redundant cast

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/history/FileHistoryCache.java

@@ -303,9 +303,9 @@ private History mergeOldAndNewHistory(File cacheFile, History histNew, Repositor
             if (!listOld.isEmpty()) {
                 RuntimeEnvironment env = RuntimeEnvironment.getInstance();
                 List<HistoryEntry> listNew = histNew.getHistoryEntries();
-                ListIterator li = listNew.listIterator(listNew.size());
+                ListIterator<HistoryEntry> li = listNew.listIterator(listNew.size());
                 while (li.hasPrevious()) {
-                    listOld.add(0, (HistoryEntry) li.previous());
+                    listOld.add(0, li.previous());
                 }
                 history = new History(listOld);