From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 4 Jan 2022 20:27:37 +0000 (-0700)
Subject: Fix a bug in FE_Face.
X-Git-Tag: v9.4.0-rc1~662^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9293c3d857123bdf41b74ea4ade7311be3a1c05b;p=dealii.git

Fix a bug in FE_Face.
---

diff --git a/source/fe/fe_face.cc b/source/fe/fe_face.cc
index bed160f792..79c9797f1d 100644
--- a/source/fe/fe_face.cc
+++ b/source/fe/fe_face.cc
@@ -956,7 +956,7 @@ FE_FaceP<dim, spacedim>::get_subface_interpolation_matrix(
           for (unsigned int k = 0; k < face_quadrature.size(); ++k)
             {
               const Point<dim - 1> p =
-                numbers::invalid_unsigned_int != 0u ?
+                subface == numbers::invalid_unsigned_int ?
                   face_quadrature.point(k) :
                   GeometryInfo<dim - 1>::child_to_cell_coordinates(
                     face_quadrature.point(k), subface);