message: remove pointless protocol magic
diff: @@ -5,7 +5,6 @@ use chain_core::property;
  #[derive(Debug, Clone)]
  pub struct UtxoDeclaration {
  - pub protocol_magic: u32,
  pub addrs: Vec<(OldAddressBytes, Value)>,
  }
  @@ -17,7 +16,6 @@ impl property::Deserialize for UtxoDeclaration {
  use chain_core::packer::*;
  use std::io::Read;
  let mut codec = Codec::from(reader);
  - let protocol_magic = codec.get_u32()?;
  let nb_entries = codec.get_u8()?;
  // FIXME add proper error
  assert!(nb_entries < 0xff);
  @@ -30,10 +28,7 @@ impl property::Deserialize for UtxoDeclaration {
  addrs.push((addr_buf, value))
  }
  - Ok(UtxoDeclaration {
  - protocol_magic: protocol_magic,
  - addrs: addrs,
  - })
  + Ok(UtxoDeclaration { addrs: addrs })
  }
  }
  @@ -46,7 +41,6 @@ impl property::Serialize for UtxoDeclaration {
  assert!(self.addrs.len() < 255);
  let mut codec = Codec::from(writer);
  - codec.put_u32(self.protocol_magic)?;
  codec.put_u8(self.addrs.len() as u8)?;
  for (b, v) in &self.addrs {
  v.serialize(&mut codec)?;
  @@ -64,7 +58,6 @@ mod test {
  impl Arbitrary for UtxoDeclaration {
  fn arbitrary<G: Gen>(g: &mut G) -> Self {
  - let protocol_magic = Arbitrary::arbitrary(g);
  let mut nb: usize = Arbitrary::arbitrary(g);
  nb = nb % 255;
  let mut addrs = Vec::with_capacity(nb);
  @@ -74,10 +67,7 @@ mod test {
  addrs.push((addr, value))
  }
  - UtxoDeclaration {
  - protocol_magic,
  - addrs,
  - }
  + UtxoDeclaration { addrs }
  }
  }
  }
  