[aravis] viewer: stop the pipeline before destroying it.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit c562ec1bc40988a0950cdb5647a1530a4204f7de
Author: Emmanuel Pacaud <emmanuel pacaud lapp in2p3 fr>
Date:   Tue Jan 4 19:10:27 2011 +0100

    viewer: stop the pipeline before destroying it.

 viewer/arvviewer.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/viewer/arvviewer.c b/viewer/arvviewer.c
index 29bb36f..ac0ff5c 100644
--- a/viewer/arvviewer.c
+++ b/viewer/arvviewer.c
@@ -80,6 +80,9 @@ arv_viewer_release_camera (ArvViewer *viewer)
 {
 	g_return_if_fail (viewer != NULL);
 
+	if (viewer->pipeline != NULL)
+		gst_element_set_state (viewer->pipeline, GST_STATE_NULL);
+
 	if (viewer->stream != NULL) {
 		g_object_unref (viewer->stream);
 		viewer->stream = NULL;