[mutter] screen-cast-stream-src: Only clean up pipewire remote/core if they exist

[Jonas Ådahl <jadahl src gnome org>]

commit 8185373bd4d23b7090dab6e4507ecad153f07099
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Oct 5 14:16:35 2017 -0400

    screen-cast-stream-src: Only clean up pipewire remote/core if they exist
    
    They can could fail to create, so lets deal better with that
    possibility.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788569

 src/backends/meta-screen-cast-stream-src.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/meta-screen-cast-stream-src.c b/src/backends/meta-screen-cast-stream-src.c
index e6d99d5..0343ea4 100644
--- a/src/backends/meta-screen-cast-stream-src.c
+++ b/src/backends/meta-screen-cast-stream-src.c
@@ -593,8 +593,8 @@ meta_screen_cast_stream_src_finalize (GObject *object)
     meta_screen_cast_stream_src_disable (src);
 
   g_clear_pointer (&priv->pipewire_stream, (GDestroyNotify) pw_stream_destroy);
-  pw_remote_destroy (priv->pipewire_remote);
-  pw_core_destroy (priv->pipewire_core);
+  g_clear_pointer (&priv->pipewire_remote, (GDestroyNotify) pw_remote_destroy);
+  g_clear_pointer (&priv->pipewire_core, (GDestroyNotify) pw_core_destroy);
   g_source_destroy (&priv->pipewire_source->base);
 
   G_OBJECT_CLASS (meta_screen_cast_stream_src_parent_class)->finalize (object);