Like lain utah said, if he can get around and walk to get to food and water he will be ok and be able to live a descent life. I have two ducklings that cant walk a straight line, hatched that way, they are now 16 days old and doing great they arent wobbly just zig zag but they make it to their food and water just
fine. I also have 2 chickens with crooked feet like your gosling and they are my best laying hens. I hatched them out myself and they are now 3 yrs old. Dont give up on him, he can learn to live with his disability.