Wrong return type for function outsideScvfWithSameIntegrationPoint

The code here may return otherScvf as a reference of a local variable if caching is disabled.

   template<class FVElementGeometry, class SubControlVolumeFace>
    static const SubControlVolumeFace& outsideScvfWithSameIntegrationPoint(const FVElementGeometry& fvGeometry, const SubControlVolumeFace& scvf)
    {
        const auto& lateralOrthogonalScvf = fvGeometry.lateralOrthogonalScvf(scvf);
        assert(!lateralOrthogonalScvf.boundary());

        const int offset = (dim == 2) ? 3 : 5;
        const auto otherLocalIdx = isOdd_(scvf.localIndex()) ? scvf.localIndex() - offset : scvf.localIndex() + offset;

        auto outsideFVGeometry = localView(fvGeometry.gridGeometry());
        const auto outsideElementIdx = fvGeometry.scv(lateralOrthogonalScvf.outsideScvIdx()).elementIndex();
        outsideFVGeometry.bindElement(fvGeometry.gridGeometry().element(outsideElementIdx));

        for (const auto& otherScvf : scvfs(outsideFVGeometry))
        {
            if (otherScvf.localIndex() == otherLocalIdx)
                return otherScvf;
        }

        DUNE_THROW(Dune::InvalidStateException, "No outside scvf found");
    }