Remove nonnull in initWithSignedPreKey

[ma11hew28]

On this line https://github.com/ChatSecure/SignalProtocol-ObjC/blob/master/Classes/Models/SignalSignedPreKey.m#L23, can we remove nonnull?

Why is nonnull specified there but not in the implementation of -[SignalPreKey initWithPreKey].

[chrisballinger]

If anything the header file should be properly annotated instead.

[ma11hew28]

Oh, OK. I see. Thank you. I didn't know what nonnull is in objective C.