[gnome-applets] Fix a reference counting bug in the mixer.

[Callum McKenzie <callum src gnome org>]

commit 028233636bb9fcd273a662794f397c8c02cdf466
Author: Callum McKenzie <callum spooky-possum org>
Date:   Fri May 22 15:28:11 2009 +1200

    Fix a reference counting bug in the mixer.
    
    The dock was being unrefed from the applet, but the applet had never claimed
    ownership in the firstplace. Hence odd crashes, see bug 546735.
---
 mixer/ChangeLog |    6 ++++++
 mixer/applet.c  |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/mixer/ChangeLog b/mixer/ChangeLog
index 5036a6b..d768ab4 100644
--- a/mixer/ChangeLog
+++ b/mixer/ChangeLog
@@ -1,3 +1,9 @@
+2009-05-22  Callum McKenzie  <callum spooky-possum org>
+
+	* applet.c (gnome_volume_applet_dispose): Explicitly ref the dock,
+	to match our unref in the dispose code. This was creating odd
+	crashes due to double-dereferencing. See bug 546735.
+
 2009-05-20  Callum McKenzie  <callum spooky-possum org>
 
 	* applet.c: 
diff --git a/mixer/applet.c b/mixer/applet.c
index dd49c26..7dcb411 100644
--- a/mixer/applet.c
+++ b/mixer/applet.c
@@ -918,6 +918,7 @@ gnome_volume_applet_orientation	(PanelApplet *_applet,
   }
   dock = gnome_volume_applet_dock_new (GTK_ORIENTATION_VERTICAL,
 				       applet);
+  g_object_ref_sink (dock); /* It isn't a child, but we do own it. */
   gtk_widget_add_events (dock, GDK_FOCUS_CHANGE_MASK);
   g_signal_connect (G_OBJECT (dock), "focus-out-event",
 		    G_CALLBACK (gnome_volume_applet_dock_focus_out),