[gnome-maps] mapView: destroy old location on location update

[Marcus Lundblad <mlundblad src gnome org>]

commit 42cb877cfe00100be45ff2acd24cffeef41b634c
Author: Valentin Blot <14005-vblot users noreply gitlab gnome org>
Date:   Tue Aug 27 11:29:15 2019 +0200

    mapView: destroy old location on location update

 src/mapView.js | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/mapView.js b/src/mapView.js
index 5d030ac..3610272 100644
--- a/src/mapView.js
+++ b/src/mapView.js
@@ -476,6 +476,8 @@ var MapView = GObject.registerClass({
         let place = Application.geoclue.place;
         let previousSelected = this._userLocation && this._userLocation.selected;
 
+        if (this._userLocation)
+            this._userLocation.destroy();
         this._userLocation = new UserLocationMarker.UserLocationMarker({ place: place,
                                                                          mapView: this });
         this._userLocationLayer.remove_all();