[Part 3] Small copy error

[goliatone]

Looking at one of the snippets in the 3rd blog post:

class AuthenticationService: ObservableObject {
  // ...
  func updateDisplayName(displayName: String) { // (2)
    if let user = Auth.auth().currentUser {
      let changeRequest = user.createProfileChangeRequest() // (3)
      changeRequest.displayName = displayName
      changeRequest.commitChanges { error in // (4)
        if error != nil {
          print("Successfully updated display name for user [\(user.uid)] to [\(displayName)]")
        }
      }
    }
  }
}

I think this is a typo? Should be error == nil:

if error != nil {
          print("Successfully updated display name for user [\(user.uid)] to [\(displayName)]")