You don't need to amend. It sounds like the only thing 8938 did was report that you would be filing a Form 3520, which you've done. Form 8938 is informational in nature anyway and doesn't compute any tax, so even if it's blank and attached to the return there won't be any negative consequences.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
