Fix spec for to_timeout/1

[fuelen]

Otherwise, dialyzer always fails:

defmodule MyTest do
  def test_function(expires_in_seconds) do
    to_timeout(second: expires_in_seconds)
  end
end

Error

lib/mytest.ex:2:no_return
Function test_function/1 has no local return.
________________________________________________________________________________
lib/mytest.ex:3:call
The function call will not succeed.

Kernel.to_timeout([{:second, _}, ...])

breaks the contract
([:component, ...] | timeout() | Duration.t()) :: timeout()
when component: [{:unit, non_neg_integer()}, ...],
     unit: :week | :day | :hour | :minute | :second | :millisecond

[sabiwara]

Thanks @fuelen ! 💜

[sabiwara]

I wonder if we can just remove component and inline the tuple, might be easier to read actually?

[josevalim]

I inlined it and I also removed .... An empty list should be fine and it already means a timeout of zero.

[josevalim]

💚 💙 💜 💛 ❤️