message: fix sonarcloud warning
diff: @@ -56,6 +56,8 @@ class CuspBase : public gko::LinOp {
  public:
  cusparseMatDescr_t get_descr() const { return this->descr_.get(); }
  + // Return shared pointer not plain pointer such that CuspGenericSpMV uses
  + // gko::Array to allocate buffer.
  std::shared_ptr<const gko::CudaExecutor> get_gpu_exec() const
  {
  return gpu_exec_;
  @@ -571,6 +573,10 @@ public:
  }
  }
  + CuspGenericCsr(const CuspGenericCsr &other) = delete;
  +
  + CuspGenericCsr &operator=(const CuspGenericCsr &other) = default;
  +
  protected:
  void apply_impl(const gko::LinOp *b, gko::LinOp *x) const override
  {
  @@ -643,6 +649,10 @@ public:
  }
  }
  + CuspGenericCoo(const CuspGenericCoo &other) = delete;
  +
  + CuspGenericCoo &operator=(const CuspGenericCoo &other) = default;
  +
  protected:
  void apply_impl(const gko::LinOp *b, gko::LinOp *x) const override
  {
  