Stoke and Cardiff are both locked in a relegation fight at the bottom of the Championship [Rex Features]Stoke City boss Mark Robins says he is trying to keep things calm going into Saturday's latest relegation crunch game at Cardiff City.After being denied three points by an injury-time equaliser from 23rd-placed Luton Town at the Bet365 Stadium, Robins' Potters now take on 22nd-placed Cardiff City.Cardiff are two points better off than Luton and a home win - coupled with Derby County winning at