What's the 'harm' in letting her leave early? = I don't see any 'harm' in letting her leave early. = There's no 'harm' in letting her leave early. [=letting her leave early will not hurt anyone or cause a bad result]
I want to be sure that no 'harm' will come to her. = I want to be sure that she won't come to any 'harm'. [=that she won't be hurt in any way]
He claims that he didn't mean any 'harm'. [=that he didn't mean to hurt or bother anyone]
(..) - I told you to run. - If I had you'd be dead. Only the demons or spirits pass through the Dark Forest, which are you? - We are fugitives, from the queen - We mean you no harm. Where are all the men? Gone. You got nothing to drink? You have traveled far, carried a great burden. (..)2012 Snow White and the Huntsman
(..) Dark army was defeated, but what would soon come to pass was far darker. Sire! Prisoner. Fear not, you will come to no harm from me or my men. What is your name milady? Ravenna, sire. So enchanted by her beauty was the king, that he forgot for the first time his broken heart. (..)2012 Snow White and the Huntsman