remove useless checksum check for truetype font processing

src/UglyToad.PdfPig.Fonts/TrueType/Parser/TableParser.cs

@@ -1,7 +1,6 @@
 namespace UglyToad.PdfPig.Fonts.TrueType.Parser
 {
     using System;
-    using System.Diagnostics;
     using Tables;
 
     internal static class TableParser
@@ -14,19 +13,7 @@
 
         public static T Parse<T>(TrueTypeHeaderTable table, TrueTypeDataBytes data, TableRegister.Builder register) where T : ITrueTypeTable
         {
-            // checksum https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6.html
-            uint sum = 0;
-            var nLongs = (table.Length + 3) / 4;
             data.Seek(table.Offset);
-            while (nLongs-- > 0)
-            {
-                sum += (uint)data.ReadSignedInt();
-            }
-
-            if (sum != table.CheckSum)
-            {
-                Debug.WriteLine("Table with invalid checksum found in TrueType font file.");
-            }
 
             if (typeof(T) == typeof(CMapTable))
             {