Remove set but unsed variables.

xfa/src/fxbarcode/datamatrix/BC_C40Encoder.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 // Original code is licensed as follows:
 /*
  * Copyright 2006-2007 Jeremias Maerki.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 120 matching lines @@
 int32_t CBC_C40Encoder::encodeChar(FX_WCHAR c, CFX_WideString& sb, int32_t& e) {
   if (c == ' ') {
     sb += (FX_WCHAR)'\3';
     return 1;
   } else if ((c >= '0') && (c <= '9')) {
     sb += (FX_WCHAR)(c - 48 + 4);
     return 1;
   } else if ((c >= 'A') && (c <= 'Z')) {
     sb += (FX_WCHAR)(c - 65 + 14);
     return 1;
-  } else if ((c >= '\0') && (c <= 0x1f)) {
+  } else if (c <= 0x1f) {
     sb += (FX_WCHAR)'\0';
     sb += c;
     return 2;
   } else if ((c >= '!') && (c <= '/')) {
     sb += (FX_WCHAR)'\1';
     sb += (FX_WCHAR)(c - 33);
     return 2;
   } else if ((c >= ':') && (c <= '@')) {
     sb += (FX_WCHAR)'\1';
     sb += (FX_WCHAR)(c - 58 + 15);
@@ skipping 37 matching lines @@
   FX_WCHAR c1 = sb.GetAt(startPos);
   FX_WCHAR c2 = sb.GetAt(startPos + 1);
   FX_WCHAR c3 = sb.GetAt(startPos + 2);
   int32_t v = (1600 * c1) + (40 * c2) + c3 + 1;
   FX_WCHAR cw1 = (FX_WCHAR)(v / 256);
   FX_WCHAR cw2 = (FX_WCHAR)(v % 256);
   CFX_WideString b1(cw1);
   CFX_WideString b2(cw2);
   return b1 + b2;
 }