Fix session handling issue

Signal/src/Loki/Onboarding/SeedVC.swift

@@ -5,7 +5,6 @@ final class SeedVC : OnboardingBaseViewController, DeviceLinkingModalDelegate {
     private var mode: Mode = .register { didSet { if mode != oldValue { handleModeChanged() } } }
     private var seed: Data! { didSet { updateMnemonic() } }
     private var mnemonic: String! { didSet { handleMnemonicChanged() } }
-    private var linkingRequestMessageSendingTimer: Timer?
 
     // MARK: Components
     private lazy var registerStackView: UIStackView = {
@@ -347,21 +346,13 @@ final class SeedVC : OnboardingBaseViewController, DeviceLinkingModalDelegate {
             present(deviceLinkingModal, animated: true, completion: nil)
             let masterHexEncodedPublicKey = masterHexEncodedPublicKeyTextField.text!.trimmingCharacters(in: CharacterSet.whitespaces)
             let linkingRequestMessage = DeviceLinkingUtilities.getLinkingRequestMessage(for: masterHexEncodedPublicKey)
-            linkingRequestMessageSendingTimer = Timer.scheduledTimer(withTimeInterval: 4, repeats: true) { [weak self] _ in
-                self?.sendLinkingRequestMessage(linkingRequestMessage)
-            }
-            sendLinkingRequestMessage(linkingRequestMessage)
+            ThreadUtil.enqueue(linkingRequestMessage)
         } else {
             onboardingController.pushDisplayNameVC(from: self)
         }
     }
-
-    private func sendLinkingRequestMessage(_ linkingRequestMessage: DeviceLinkMessage) {
-        ThreadUtil.enqueue(linkingRequestMessage)
-    }
     
     func handleDeviceLinkAuthorized(_ deviceLink: DeviceLink) {
-        linkingRequestMessageSendingTimer?.invalidate()
         let userDefaults = UserDefaults.standard
         userDefaults.set(true, forKey: "didUpdateForMainnet")
         userDefaults.set(deviceLink.master.hexEncodedPublicKey, forKey: "masterDeviceHexEncodedPublicKey")
@@ -370,7 +361,6 @@ final class SeedVC : OnboardingBaseViewController, DeviceLinkingModalDelegate {
     }
     
     func handleDeviceLinkingModalDismissed() {
-        linkingRequestMessageSendingTimer?.invalidate()
         let appDelegate = UIApplication.shared.delegate as! AppDelegate
         appDelegate.stopLongPollerIfNeeded()
         TSAccountManager.sharedInstance().resetForReregistration()