Fix colorType/alphaType checks in SkCodec

src/codec/SkGifCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec.h"
 #include "SkColorTable.h"
 #include "SkImageInfo.h"
@@ skipping 110 matching lines @@
 
     /*
      * Initializes the swizzler.
      *
      * @param dstInfo  Output image information.  Dimensions may have been
      *                 adjusted if the image frame size does not match the size
      *                 indicated in the header.
      * @param options  Informs the swizzler if destination memory is zero initialized.
      *                 Contains subset information.
      */
-    Result initializeSwizzler(const SkImageInfo& dstInfo,
+    void initializeSwizzler(const SkImageInfo& dstInfo,
             const Options& options);
 
     SkSampler* getSampler(bool createIfNecessary) override {
         SkASSERT(fSwizzler);
         return fSwizzler;
     }
 
     /*
      * @return true if the read is successful and false if the read fails.
      */
@@ skipping 52 matching lines @@
     SkAutoTDeleteArray<uint8_t>             fSrcBuffer;
     const SkIRect                           fFrameRect;
     const uint32_t                          fTransIndex;
     uint32_t                                fFillIndex;
     const bool                              fFrameIsSubset;
     SkAutoTDelete<SkSwizzler>               fSwizzler;
     SkAutoTUnref<SkColorTable>              fColorTable;
 
     typedef SkCodec INHERITED;
 };