fix missing return in error case for bitmap scaler

src/core/SkBitmapScaler.cpp

Index: src/core/SkBitmapScaler.cpp
diff --git a/src/core/SkBitmapScaler.cpp b/src/core/SkBitmapScaler.cpp
index aaee600c8f8650dff77582d9cfdea3168b53c901..0fd2c7baf3fb2c74ae4625cf908e964b9ea12d73 100644
--- a/src/core/SkBitmapScaler.cpp
+++ b/src/core/SkBitmapScaler.cpp
@@ -264,6 +264,7 @@ bool SkBitmapScaler::Resize(SkBitmap* resultPtr,
         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