Clean up XFA code which causes warnings

xfa/fxbarcode/oned/BC_OneDimReader.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 2008 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 193 matching lines @@
   for (int32_t i = 0; i < max; i++) {
     int32_t variance = PatternMatchVariance(counters, &patterns[i * 4],
                                             MAX_INDIVIDUAL_VARIANCE);
     if (variance < bestVariance) {
       bestVariance = variance;
       bestMatch = i;
     }
   }
   if (bestMatch >= 0) {
     return bestMatch;
-  } else {
-    e = BCExceptionNotFound;
-    return 0;
   }
+  e = BCExceptionNotFound;
   return 0;
 }