Nullability warnings on APCPasscodeViewController.h

[brendenwest]

I'm getting - "Pointer is missing a nullability type specifier (__nonnull or __nullable)" - warnings on the APCPasscodeViewControllerDelegate protocol definition:

• (void)passcodeViewControllerDidSucceed:(APCPasscodeViewController *)viewController;
• (void)passcodeViewControllerDidFail:(APCPasscodeViewController *)viewController;