[goobox] fixed crash when closing the cover chooser dialog

[Paolo Bacchilega <paobac src gnome org>]

commit 923afc9056c8c20fc9b607bdbeee34faf478eb7d
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Tue Dec 4 16:13:21 2012 +0100

    fixed crash when closing the cover chooser dialog

 src/dlg-cover-chooser.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/dlg-cover-chooser.c b/src/dlg-cover-chooser.c
index d043ed7..8491111 100644
--- a/src/dlg-cover-chooser.c
+++ b/src/dlg-cover-chooser.c
@@ -194,6 +194,8 @@ destroy_cb (GtkWidget  *widget,
 		return;
 	}
 
+	g_signal_handlers_disconnect_by_data (data->icon_view, data);
+
 	g_object_unref (data->cancellable);
 	_g_string_list_free (data->file_list);
 	_g_object_unref (data->cover_backup);