bugfix for typo in skpdiff tool

tools/skpdiff/SkDiffContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkImageDecoder.h"
 #include "SkOSFile.h"
@@ skipping 90 matching lines @@
     // Perform each diff
     for (int differIndex = 0; differIndex < fDifferCount; differIndex++) {
         SkImageDiffer* differ = fDiffers[differIndex];
 
         // Copy the results into data for this record
         DiffData& diffData = newRecord->fDiffs.push_back();
         diffData.fDiffName = differ->getName();
 
         if (!differ->diff(&baselineBitmap, &testBitmap, alphaMaskPending, &diffData.fResult)) {
             // if the diff failed record -1 as the result
-            diffData.fResult = -1;
+            diffData.fResult.result = -1;
             continue;
         }
 
         if (alphaMaskPending
                 && SkImageDiffer::RESULT_CORRECT != diffData.fResult.result
                 && !diffData.fResult.poiAlphaMask.empty()
                 && !newRecord->fCommonName.isEmpty()) {
 
             newRecord->fDifferencePath = SkOSPath::SkPathJoin(fDifferenceDir.c_str(),
                                                               newRecord->fCommonName.c_str());
@@ skipping 229 matching lines @@
         for (int i = 0; i < cntColumns; i++) {
             SkString str;
             str.printf(", %f", values[i]);
             stream.writeText(str.c_str());
         }
         stream.writeText("\n");
 
         currentRecord = iter2.next();
     }
 }