[goffice] Do not unref twice the same component editor.

[Jean BrÃfort <jbrefort src gnome org>]

commit c94b4d7550b215e65426939b030c95d408d74da2
Author: Jean Brefort <jean brefort normalesup org>
Date:   Sat Jul 21 18:02:08 2012 +0200

    Do not unref twice the same component editor.

 ChangeLog                        |    5 +++++
 goffice/component/go-component.c |    1 +
 2 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index b463116..e607116 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-21  Jean Brefort  <jean brefort normalesup org>
+
+	* goffice/component/go-component.c (go_component_stop_editing): do not
+	unref twice the same object. Related to #680190.
+
 2012-07-20  Jean Brefort  <jean brefort normalesup org>
 
 	* goffice/component/go-component.c (go_component_finalize),
diff --git a/goffice/component/go-component.c b/goffice/component/go-component.c
index 5546fa8..eceb67d 100644
--- a/goffice/component/go-component.c
+++ b/goffice/component/go-component.c
@@ -498,6 +498,7 @@ void go_component_stop_editing (GOComponent *component)
 	g_return_if_fail (GO_IS_COMPONENT (component));
 	if (component->editor)
 		gtk_widget_destroy (GTK_WIDGET (component->editor));
+	component->editor = NULL;
 }
 
 void