message: fix invalid usage of standard Vec
diff: @@ -96,7 +96,7 @@ impl Readable for InitialEnts {
  while !(buf.is_end()) {
  let taglen = TagLen(buf.get_u16()?);
  let (tag, len) = taglen.deconstruct();
  - let mut bytes = vec![0u8; len];
  + let mut bytes = Vec::with_capacity(len);
  bytes.extend_from_slice(buf.get_slice(len)?);
  ents.push((tag, bytes))
  }
  