manual position: fix force-close on early stop

src/location/FixedPosition.scala

@@ -32,7 +32,6 @@ class FixedPosition(service : AprsService, prefs : PrefsWrapper) extends Locatio
 	var alreadyRunning = false
 
 	override def start(singleShot : Boolean) = {
-		if (alreadyRunning)
 		stop()
 		alreadyRunning = true
 
@@ -47,6 +46,7 @@ class FixedPosition(service : AprsService, prefs : PrefsWrapper) extends Locatio
 
 	override def stop() {
 		manager.cancel(pendingIntent)
+		if (alreadyRunning)
 			service.unregisterReceiver(receiver)
 	}