Fixed a few places where uninitialized memory could have been read

src/effects/SkMatrixConvolutionImageFilter.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 "SkMatrixConvolutionImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 64 matching lines @@
         SkASSERT(success);
     } else {
         fKernel = 0;
     }
     fGain = buffer.readScalar();
     fBias = buffer.readScalar();
     fTarget.fX = buffer.readInt();
     fTarget.fY = buffer.readInt();
     fTileMode = (TileMode) buffer.readInt();
     fConvolveAlpha = buffer.readBool();
-    buffer.validate((fKernel != 0) &&
+    buffer.validate(buffer.validate(true) &&
+                    (fKernel != 0) &&
                     SkScalarIsFinite(fGain) &&
                     SkScalarIsFinite(fBias) &&
                     tile_mode_is_valid(fTileMode));
 }
 
 void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeInt(fKernelSize.fWidth);
     buffer.writeInt(fKernelSize.fHeight);
     buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
@@ skipping 564 matching lines @@
                                                 fBias,
                                                 fTarget,
                                                 fTileMode,
                                                 fConvolveAlpha);
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif