Don't worry, this is really common and is not a warranty issue. Simply take your skis or snowboard out for a ride and this will come off. You can also use a Servicing Kit to take the rust off.
Next time you're heading to the hill, make sure you dry your gear down properly before storage/travel to help reduce the risk of rust and then store in a Ski Bag or Snowboard Bag in a cool, dry place. Remember, water can get trapped under the bindings, so check your kit carefully before you stash it away!