(IntOpener.TryOpen): clear directory before attempting new entry size.

ArcFormats/CatSystem/ArcINT.cs

@@ -146,6 +146,7 @@ namespace GameRes.Formats.CatSystem
             var dir = new List<Entry> (entry_count);
             foreach (var name_length in NameSizes)
             {
+                dir.Clear();
                 try
                 {
                     long current_offset = 8;