Bad pattern match in NKEYS.Xkeys.open/3

[davydog187]

Found by Elixir 1.18

Compiling 4 files (.ex)
    warning: the following clause will never match:

        :error

    because it attempts to match on the result of:

        Kcl.unbox(message, nonce, our_secret, their_public)

    which has type:

        dynamic({:error, binary()} or {:error or binary(), term()})

    typing violation found at:
    │
 37 │       :error -> :error
    │       ~~~~~~~~~~~~~~~~
    │
    └─ lib/nkeys/xkeys.ex:37: NKEYS.Xkeys.open/3