Possible issue with incorrect errno usage

[botov]

As you know errno provides error code of the latest system code failed. So in the following method:
public class func dataForKey(keyName: String) -> NSData? { ...
probably this was meant here:
return status == errSecSuccess ? result as? NSData : nil
instead of this:
return status == noErr ? result as? NSData : nil

[botov]

Sorry, I was wrong.

noErr OSErr: function performed properly - no error

I thought that's an Swift's equivalent of errno.