better variable naming

Author: Vladimir Kotal

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

@@ -278,9 +278,9 @@ public History getHistory(File file, boolean withFiles, boolean ui)
     public InputStream getRevision(String parent, String basename, String rev) {
         InputStream ret = null;
 
-        Repository rep = getRepository(new File(parent));
-        if (rep != null) {
-            ret = rep.getHistoryGet(parent, basename, rev);
+        Repository repo = getRepository(new File(parent));
+        if (repo != null) {
+            ret = repo.getHistoryGet(parent, basename, rev);
         }
         return ret;
     }