message: Pass initial hash to `LinearChainSync` constructor
diff: @@ -132,12 +132,10 @@ impl<R: Rng + CryptoRng + ?Sized> reactor::Reactor<R> for Reactor {
  let mut effects = reactor::wrap_effects(Event::Network, net_effects);
  - // TODO
  - let init_hash = None;
  let effect_builder = EffectBuilder::new(event_queue);
  let (linear_chain_sync, linear_effects) =
  - LinearChainSync::new(Vec::new(), effect_builder, init_hash);
  + LinearChainSync::new(Vec::new(), effect_builder, config.node.trusted_hash);
  effects.extend(reactor::wrap_effects(
  Event::LinearChainSync,
  