As long as you're sure you've checked the dipstick properly (level ground, warmed up to operating temp, engine off) and it still reads higher than max, then you should drain a bit until the correct level is reached. In the long term, masama siya, but as long as you drain the excess amount soon then you should be fine.

Otherwise, you're forcing the engine seals to wear more due to the added volume of oil they have to handle.