message: move InitCuSparse to protected
diff: @@ -88,6 +88,9 @@ protected:
  bool useCuSparse{true}; //Use CuSparse if available
  + // Initialize CuSparse
  + void InitCuSparse();
  +
  #ifdef MFEM_USE_CUDA
  cusparseStatus_t status;
  static cusparseHandle_t handle;
  @@ -145,9 +148,6 @@ public:
  /// Create a SparseMatrix with diagonal @a v, i.e. A = Diag(v)
  SparseMatrix(const Vector & v);
  - // Initialize CuSparse
  - void InitCuSparse();
  -
  // Runtime option to use CuSparse
  // Only valid when using a CUDA backend
  void UseCuSparse(bool _useCuSparse = true) { useCuSparse = _useCuSparse;}
  