discoverer: Don't ref a NULL caps

https://bugzilla.gnome.org/show_bug.cgi?id=632988

diff --git a/gst-libs/gst/pbutils/gstdiscoverer-types.c b/gst-libs/gst/pbutils/gstdiscoverer-types.c
index b4c51c3..b7c978c 100644 (file)
--- a/gst-libs/gst/pbutils/gstdiscoverer-types.c
+++ b/gst-libs/gst/pbutils/gstdiscoverer-types.c
@@ -539,7 +539,9 @@ gst_discoverer_stream_info_get_caps (GstDiscovererStreamInfo * info)
 {
   g_return_val_if_fail (GST_IS_DISCOVERER_STREAM_INFO (info), NULL);
 
-  return gst_caps_ref (info->caps);
+  if (info->caps)
+    return gst_caps_ref (info->caps);
+  return NULL;
 }
 
 /**