Fix the leak of CIImage based UIImage for `sd_colorAtPoint`
Fix the leak of CIImage based UIImage for `sd_colorAtPoint`

awkward/SDWebImage,dreampiggy/SDWebImage,dreampiggy/SDWebImage,tualatrix/SDWebImage,awkward/SDWebImage,awkward/SDWebImage,dreampiggy/SDWebImage,rs/SDWebImage