discoverer: Do not try to unref the bus if it has not been set yet

It might happen if creation of the discoverer failed

diff --git a/gst-libs/gst/pbutils/gstdiscoverer.c b/gst-libs/gst/pbutils/gstdiscoverer.c
index d155323..ff79471 100644 (file)
--- a/gst-libs/gst/pbutils/gstdiscoverer.c
+++ b/gst-libs/gst/pbutils/gstdiscoverer.c
@@ -393,7 +393,8 @@ gst_discoverer_dispose (GObject * obj)
 
     /* pipeline was set to NULL in _reset */
     gst_object_unref (dc->priv->pipeline);
-    gst_object_unref (dc->priv->bus);
+    if (dc->priv->bus)
+      gst_object_unref (dc->priv->bus);
 
     dc->priv->pipeline = NULL;
     dc->priv->uridecodebin = NULL;