std::min on unitialized value

Change-Id: I3d1fdf90094170f8b256bbd0a9af28b69ef16a8c
Reviewed-on: https://gerrit.libreoffice.org/53662Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/bitmap/BitmapSimpleColorQuantizationFilter.cxx

@@ -32,7 +32,7 @@ BitmapEx BitmapSimpleColorQuantizationFilter::execute(BitmapEx const& aBitmapEx)
     {
         Bitmap aNewBmp;
         Bitmap::ScopedReadAccess pRAcc(aBitmap);
-        const sal_uInt16 nColorCount = std::min(nColorCount, sal_uInt16(256));
+        const sal_uInt16 nColorCount = std::min(mnNewColorCount, sal_uInt16(256));
         sal_uInt16 nBitCount = 0;
 
         if (pRAcc)