I am seeing that as basically defensive coding. Similar to how you may do this:

  switch (mode) {
      case FOO: ... break;
      case BAR: ... break;
  }

Do you need the very last break? Technically no, but including it so that you don't forget it when you need it later can be a good idea.

(Also, I think explicitly using comparison operators in conditionals might be the idiomatic thing to do in Go. Someone correct me here if I'm wrong about that.)