TunnelListFragment: onCreateActionMode is called before adapter is alive

Long press a tunnel item. SIGKILL the app. Reenter it. Boom:

kotlin.KotlinNullPointerException:
  at com.wireguard.android.fragment.TunnelListFragment$ActionModeListener.onCreateActionMode (TunnelListFragment.java:347)
  at androidx.appcompat.app.AppCompatDelegateImpl$ActionModeCallbackWrapperV9.onCreateActionMode (AppCompatDelegateImpl.java:2442)
  at androidx.appcompat.app.WindowDecorActionBar$ActionModeImpl.dispatchOnCreate (WindowDecorActionBar.java:1062)
  at androidx.appcompat.app.WindowDecorActionBar.startActionMode (WindowDecorActionBar.java:530)
  at androidx.appcompat.app.AppCompatDelegateImpl.startSupportActionMode (AppCompatDelegateImpl.java:1055)
  at androidx.appcompat.app.AppCompatActivity.startSupportActionMode (AppCompatActivity.java:316)
  at com.wireguard.android.fragment.TunnelListFragment$ActionModeListener.setItemChecked (TunnelListFragment.java:371)
  at com.wireguard.android.fragment.TunnelListFragment.onActivityCreated (TunnelListFragment.java:174)
  at androidx.fragment.app.Fragment.performActivityCreated (Fragment.java:2717)
  at androidx.fragment.app.FragmentStateManager.activityCreated (FragmentStateManager.java:346)
  at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:1188)
  at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:161)
  at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:1356)
  at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:5)
  at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState (FragmentManager.java:1434)
  at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState (FragmentManager.java:5)
  at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:1497)
  at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:389)
  at androidx.fragment.app.FragmentManager.dispatchStateChange (FragmentManager.java:2625)
  at androidx.fragment.app.FragmentManager.dispatchStateChange (FragmentManager.java:677)
  at androidx.fragment.app.FragmentManager.dispatchActivityCreated (FragmentManager.java:2577)
  at androidx.fragment.app.FragmentManager.dispatchActivityCreated (FragmentManager.java:9)
  at androidx.fragment.app.FragmentController.dispatchActivityCreated (FragmentController.java:247)
  at androidx.fragment.app.FragmentActivity.onStart (FragmentActivity.java:541)
  at androidx.appcompat.app.AppCompatActivity.onStart (AppCompatActivity.java:201)
  at android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1440)
  at android.app.Activity.performStart (Activity.java:8109)
  at android.app.ActivityThread.handleStartActivity (ActivityThread.java:3806)
  at android.app.servertransaction.TransactionExecutor.performLifecycleSequence (TransactionExecutor.java:235)
  at android.app.servertransaction.TransactionExecutor.cycleToPath (TransactionExecutor.java:215)
  at android.app.servertransaction.TransactionExecutor.executeLifecycleState (TransactionExecutor.java:187)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:105)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2386)
  at android.os.Handler.dispatchMessage (Handler.java:107)
  at android.os.Looper.loop (Looper.java:213)
  at android.app.ActivityThread.main (ActivityThread.java:8178)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:513)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1101)

This commit avoids the crash. But it's not clear to me that this is
really the right solution. However, in testing it appears to work.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/fragment/TunnelListFragment.kt

@@ -344,7 +344,7 @@ class TunnelListFragment : BaseFragment() {
                 resources = activity!!.resources
             }
             mode.menuInflater.inflate(R.menu.tunnel_list_action_mode, menu)
-            binding!!.tunnelList.adapter!!.notifyDataSetChanged()
+            binding?.tunnelList?.adapter?.notifyDataSetChanged()
             return true
         }