Ensure Subrouting is closed if register fails

mobile/src/main/java/be/mygod/vpnhotspot/net/Subrouting.kt

@@ -62,8 +62,12 @@ class Subrouting(private val parent: Routing, priority: Int, val upstream: Strin
 
     init {
         Timber.d("Subrouting initialized from %s to %s", parent.downstream, upstream)
-        Timber.d(Thread.currentThread().stackTrace.joinToString("\n"))
+        try {
             IpNeighbourMonitor.registerCallback(this)
+        } catch (e: Exception) {
+            close()
+            throw e
+        }
     }
 
     /**
@@ -72,7 +76,6 @@ class Subrouting(private val parent: Routing, priority: Int, val upstream: Strin
     override fun close() {
         IpNeighbourMonitor.unregisterCallback(this)
         Timber.d("Subrouting closed from %s to %s", parent.downstream, upstream)
-        Timber.d(Thread.currentThread().stackTrace.joinToString("\n"))
     }
 
     override fun onIpNeighbourAvailable(neighbours: List<IpNeighbour>) = synchronized(parent) {