I got this off the Carnival website.A hair dryer is provided in the bathroom (Destiny, Triumph, Victory) or at the desk/vanity in the stateroom (Spirit, Pride, Legend, Conquest, Glory, Miracle, Valor, Liberty, Freedom, Splendor and Dream). Hair dryers are not provided in the staterooms of all other ships.. So it looks like you are covered.
Have a Blast. My sister had a cruise on that ship and she loved it..