fix missing return in error case for bitmap scaler

src/core/SkBitmapScaler.cpp

 #include "SkBitmapScaler.h"
 #include "SkBitmapFilter.h"
 #include "SkRect.h"
 #include "SkTArray.h"
 #include "SkErrorInternals.h"
 #include "SkConvolver.h"
 
 // SkResizeFilter ----------------------------------------------------------------
 
 // Encapsulates computation and storage of the filters required for one complete
@@ skipping 246 matching lines @@
     SkASSERT(((RESIZE_FIRST_QUALITY_METHOD <= method) &&
         (method <= RESIZE_LAST_QUALITY_METHOD)) ||
         ((RESIZE_FIRST_ALGORITHM_METHOD <= method) &&
         (method <= RESIZE_LAST_ALGORITHM_METHOD)));
 
     SkRect dest = { 0, 0, destWidth, destHeight };
     if (!dest.contains(destSubset)) {
         SkErrorInternals::SetError( kInvalidArgument_SkError,
                                     "Sorry, the destination bitmap scale subset "
                                     "falls outside the full destination bitmap." );
+        return false;
     }
 
     // If the size of source or destination is 0, i.e. 0x0, 0xN or Nx0, just
     // return empty.
     if (source.width() < 1 || source.height() < 1 ||
         destWidth < 1 || destHeight < 1) {
         // todo: seems like we could handle negative dstWidth/Height, since that
         // is just a negative scale (flip)
         return false;
     }
@@ skipping 46 matching lines @@
 SkBitmap SkBitmapScaler::Resize(const SkBitmap& source,
                                 ResizeMethod method,
                                 float destWidth, float destHeight,
                                 SkBitmap::Allocator* allocator) {
   SkBitmap result;
   if (!Resize(&result, source, method, destWidth, destHeight, allocator)) {
     return SkBitmap();
   }
   return result;
 }