message: Update image_tensor_specs.cc
  is mutable's are boolean.
diff: @@ -191,8 +191,8 @@ StatusOr<ImageTensorSpecs> BuildInputImageTensorSpecs(
  "Only height and width is mutable for now.",
  TfLiteSupportStatus::kInvalidArgumentError);
  - const int height_mutable = dims_signature->data[1];
  - const int width_mutable = dims_signature->data[2];
  + const bool height_mutable = dims_signature->data[1] == -1;
  + const bool width_mutable = dims_signature->data[2] == -1;
  if (height_mutable || width_mutable)
  {
  