message: Getting rid of spurious assert
diff: @@ -154,7 +154,6 @@ impl<I: Clone + PartialEq + 'static> LinearChainFastSync<I> {
  ..
  } if highest_block_seen == block_height => {
  // TODO: Fail gracefully in these cases
  - assert_eq!(highest_block_seen, block_height);
  match latest_block.as_ref() {
  Some(expected) => assert_eq!(
  expected, &block_header,
  