Prevent double free of CPU memory

src/KOKKOS/atom_vec_kokkos.cpp

@@ -40,6 +40,15 @@ AtomVecKokkos::AtomVecKokkos(LAMMPS *lmp) : AtomVec(lmp)
 
 /* ---------------------------------------------------------------------- */
 
+AtomVecKokkos::~AtomVecKokkos()
+{
+  // Kokkos already deallocated host memory
+
+  ngrow = 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
 template<class DeviceType,int PBC_FLAG,int TRICLINIC>
 struct AtomVecKokkos_PackComm {
   typedef DeviceType device_type;

src/KOKKOS/atom_vec_kokkos.h

@@ -36,6 +36,7 @@ union d_ubuf {
 class AtomVecKokkos : virtual public AtomVec {
  public:
   AtomVecKokkos(class LAMMPS *);
+  ~AtomVecKokkos();
 
   virtual void sync(ExecutionSpace space, unsigned int mask) = 0;
   virtual void modified(ExecutionSpace space, unsigned int mask) = 0;