message: fix dense bounds check
diff: @@ -471,8 +471,7 @@ protected:
  values_{exec, std::forward<ValuesArray>(values)},
  stride_{stride}
  {
  - GKO_ASSERT_EQ((size[0] - 1) * stride + size[1],
  - values_.get_num_elems());
  + GKO_ASSERT_EQ(size[0] * stride, values_.get_num_elems());
  }
  /**
  