Reenable warnings in src/codec

src/codec/SkBmpRLECodec.cpp

 /*
  * 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 "SkBmpRLECodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 37 matching lines @@
         SkCodecPrintf("Error: cannot convert input type to output type.\n");
         return kInvalidConversion;
     }
 
     Result result = this->prepareToDecode(dstInfo, opts, inputColorPtr, inputColorCount);
     if (kSuccess != result) {
         return result;
     }
 
     // Perform the decode
-    uint32_t rows = this->decodeRows(dstInfo, dst, dstRowBytes, opts);
+    int rows = this->decodeRows(dstInfo, dst, dstRowBytes, opts);
     if (rows != dstInfo.height()) {
         // We set rowsDecoded equal to the height because the background has already
         // been filled.  RLE encodings sometimes skip pixels, so we always start by
         // filling the background.
         *rowsDecoded = dstInfo.height();
         return kIncompleteInput;
     }
 
     return kSuccess;
 }
@@ skipping 437 matching lines @@
         fSampler.reset(new SkBmpRLESampler(this));
     }
 
     return fSampler;
 }
 
 int SkBmpRLECodec::setSampleX(int sampleX){
     fSampleX = sampleX;
     return get_scaled_dimension(this->getInfo().width(), sampleX);
 }