emboss filter broken

since...

commit 4b183ae9
Author: Chris Sherlock <chris.sherlock79@gmail.com>
Date:   Fri Apr 20 21:00:46 2018 +1000

    vcl: ImplEmbossGrey() -> BitmapEmbossGreyFilter

    Change-Id: I6e541e9ca9cf61dfa8df9638a4ba4b8bd1d3ad71
    Reviewed-on: https://gerrit.libreoffice.org/53204Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

Change-Id: If1a96d2165a3c003b9f3cb5a922d08c12156fd29
Reviewed-on: https://gerrit.libreoffice.org/60669
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/bitmap/BitmapEmbossGreyFilter.cxx

@@ -145,7 +145,7 @@ BitmapEx BitmapEmbossGreyFilter::execute(BitmapEx const& rBitmapEx) const
     }
 
     if (bRet)
-        return rBitmapEx;
+        return BitmapEx(aBitmap);
 
     return BitmapEx();
 }