Apple claim that the fingerprint is not stored in a way for which the fingerprint itself could be reconstructed - which makes sense.
https://ssl.apple.com/iphone/business/docs/iOS_Security_Feb1...
https://ssl.apple.com/iphone/business/docs/iOS_Security_Feb1...
Also, hash plus salt together is info that identifies a fingerprint. Why shouldn't it be possible to leak that info? Once you have it, you can apply it to your existing database of fingerprints to get matches - no actual fingerprint image needed...