Fix compiler warnings in atom_vec_hybrid_kokkos

src/KOKKOS/atom_vec_hybrid_kokkos.cpp

@@ -255,6 +255,7 @@ int AtomVecHybridKokkos::pack_comm_kokkos(const int &n, const DAT::tdual_int_2d
                      const int &pbc_flag, const int pbc[])
 {
   error->all(FLERR,"AtomVecHybridKokkos doesn't yet support threaded comm");
+  return 0;
 }
 void AtomVecHybridKokkos::unpack_comm_kokkos(const int &n, const int &nfirst,
                         const DAT::tdual_xfloat_2d &buf)
@@ -266,12 +267,14 @@ int AtomVecHybridKokkos::pack_comm_self(const int &n, const DAT::tdual_int_2d &l
                    const int &pbc_flag, const int pbc[])
 {
   error->all(FLERR,"AtomVecHybridKokkos doesn't yet support threaded comm");
+  return 0;
 }
 int AtomVecHybridKokkos::pack_border_kokkos(int n, DAT::tdual_int_2d k_sendlist,
                        DAT::tdual_xfloat_2d buf,int iswap,
                        int pbc_flag, int *pbc, ExecutionSpace space)
 {
   error->all(FLERR,"AtomVecHybridKokkos doesn't yet support threaded comm");
+  return 0;
 }
 void AtomVecHybridKokkos::unpack_border_kokkos(const int &n, const int &nfirst,
                           const DAT::tdual_xfloat_2d &buf,
@@ -286,12 +289,14 @@ int AtomVecHybridKokkos::pack_exchange_kokkos(const int &nsend,DAT::tdual_xfloat
                          X_FLOAT lo, X_FLOAT hi)
 {
   error->all(FLERR,"AtomVecHybridKokkos doesn't yet support threaded comm");
+  return 0;
 }
 int AtomVecHybridKokkos::unpack_exchange_kokkos(DAT::tdual_xfloat_2d &k_buf, int nrecv,
                            int nlocal, int dim, X_FLOAT lo, X_FLOAT hi,
                            ExecutionSpace space)
 {
   error->all(FLERR,"AtomVecHybridKokkos doesn't yet support threaded comm");
+  return 0;
 }
 
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