Fixed a few places where uninitialized memory could have been read

src/effects/SkMergeImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMergeImageFilter.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
@@ skipping 147 matching lines @@
 }
 
 SkMergeImageFilter::SkMergeImageFilter(SkFlattenableReadBuffer& buffer)
   : INHERITED(-1, buffer) {
     bool hasModes = buffer.readBool();
     if (hasModes) {
         this->initAllocModes();
         int nbInputs = countInputs();
         size_t size = nbInputs * sizeof(fModes[0]);
         SkASSERT(buffer.getArrayCount() == size);
-        buffer.readByteArray(fModes, size);
-        for (int i = 0; i < nbInputs; ++i) {
-            buffer.validate(SkIsValidMode((SkXfermode::Mode)fModes[i]));
+        if (buffer.readByteArray(fModes, size)) {
+            for (int i = 0; i < nbInputs; ++i) {
+                buffer.validate(SkIsValidMode((SkXfermode::Mode)fModes[i]));
+            }
         }
     } else {
         fModes = 0;
     }
 }