decrement lockcount if we failed to get pixels

src/core/SkPixelRef.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 "SkBitmapCache.h"
 #include "SkMutex.h"
 #include "SkPixelRef.h"
@@ skipping 139 matching lines @@
             // For compatibility with SkBitmap calling lockPixels, we still want to increment
             // fLockCount even if we failed. If we updated SkBitmap we could remove this oddity.
             fLockCount += 1;
             return false;
         }
     }
     if (fRec.fPixels) {
         validate_pixels_ctable(fInfo, fRec.fColorTable);
         return true;
     }
+    // no pixels, so we failed (somehow)
+    --fLockCount;
     return false;
 }
 
 bool SkPixelRef::lockPixels(LockRec* rec) {
     if (this->lockPixels()) {
         *rec = fRec;
         return true;
     }
     return false;
 }
@@ skipping 174 matching lines @@
     }
 
     result->fUnlockProc = unlock_legacy_result;
     result->fUnlockContext = SkRef(this);   // this is balanced in our fUnlockProc
     result->fCTable = fRec.fColorTable;
     result->fPixels = fRec.fPixels;
     result->fRowBytes = fRec.fRowBytes;
     result->fSize.set(fInfo.width(), fInfo.height());
     return true;
 }