Enable init'ed but unused var warning on windows for closer parity with mac/linux warnings.

src/views/win/SkOSWindow_win.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkTypes.h"
 
 #if defined(SK_BUILD_FOR_WIN)
@@ skipping 184 matching lines @@
         // Do the SetDIBitsToDevice.
         //
         // TODO(wjmaclean):
         //       Fix this call to handle SkBitmaps that have rowBytes != width,
         //       i.e. may have padding at the end of lines. The SkASSERT below
         //       may be ignored by builds, and the only obviously safe option
         //       seems to be to copy the bitmap to a temporary (contiguous)
         //       buffer before passing to SetDIBitsToDevice().
         SkASSERT(bitmap.width() * bitmap.bytesPerPixel() == bitmap.rowBytes());
         bitmap.lockPixels();
-        int iRet = SetDIBitsToDevice(hdc,
+        int ret = SetDIBitsToDevice(hdc,
             0, 0,
             bitmap.width(), bitmap.height(),
             0, 0,
             0, bitmap.height(),
             bitmap.getPixels(),
             &bmi,
             DIB_RGB_COLORS);
+        (void)ret; // we're ignoring potential failures for now.
         bitmap.unlockPixels();
     }
 }
 
 #if 0
 void SkOSWindow::updateSize()
 {
     RECT    r;
     GetWindowRect((HWND)this->getHWND(), &r);
     this->resize(r.right - r.left, r.bottom - r.top);
@@ skipping 379 matching lines @@
         break;
 #endif // SK_ANGLE
 #endif // SK_SUPPORT_GPU
     default:
         SkASSERT(false);
         break;
     }
 }
 
 #endif