Apply suggestions from @nuclearkevin

Co-authored-by: Kevin Sawatzky <66632997+nuclearkevin@users.noreply.github.com>

Author: pshriwise

src/initialize.cpp

@@ -95,7 +95,7 @@ int openmc_init(int argc, char* argv[], const void* intracomm)
   // libMesh was initialized externally. If libMesh was initialized internally,
   // the XDG config will use the internal initialization and communicator.
   xdg::config::external_libmesh_init = settings::libmesh_init.get();
-  xdg::config::external_libmesh_comm = &(settings::libmesh_init->comm());
+  xdg::config::external_libmesh_comm = settings::libmesh_comm;
 #endif
 #endif
 

src/xdg.cpp

@@ -182,7 +182,7 @@ Position XDGMesh::centroid(int bin) const
 
   centroid /= double(element_vertices.size());
 
-  return {centroid[0], centroid[1], centroid[1]};
+  return {centroid[0], centroid[1], centroid[2]};
 }
 
 int XDGMesh::n_vertices() const