To my knowledge: There's no way to unsave a comment. 'Save' and 'Upvote' are essentially the same function. While you will eventually receive downvote privileg

To my knowledge: There's no way to unsave a comment. 'Save' and 'Upvote' are essentially the same function. While you will eventually receive downvote privileges for comments (never for stories), there's no ability to change from an upvote to a downvote or vice versa. (Which leads to occasional mis-votes, especially on mobile devices.) So an upvote can never be revoked or changed; and therefore never can a saved comment. Welcome onboard by the way!