[network-manager-applet] editor: fix bad memory access in wsec_size_group_clear()

[Beniamino Galvani <bgalvani src gnome org>]

commit 6b0de82dd52d0f9c7279a0dcae7d4b6a8e0cf5f0
Author: Beniamino Galvani <bgalvani redhat com>
Date:   Wed Jan 4 14:25:07 2017 +0100

    editor: fix bad memory access in wsec_size_group_clear()
    
    Elements of the list returned by gtk_size_group_get_widgets() become
    invalid after the call to gtk_size_group_remove_widget().

 src/connection-editor/page-wifi-security.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/connection-editor/page-wifi-security.c b/src/connection-editor/page-wifi-security.c
index 4b366ea..b775aa9 100644
--- a/src/connection-editor/page-wifi-security.c
+++ b/src/connection-editor/page-wifi-security.c
@@ -107,14 +107,15 @@ stuff_changed_cb (WirelessSecurity *sec, gpointer user_data)
 static void
 wsec_size_group_clear (GtkSizeGroup *group)
 {
-       GSList *children;
        GSList *iter;
 
        g_return_if_fail (group != NULL);
 
-       children = gtk_size_group_get_widgets (group);
-       for (iter = children; iter; iter = g_slist_next (iter))
+       iter = gtk_size_group_get_widgets (group);
+       while (iter) {
                gtk_size_group_remove_widget (group, GTK_WIDGET (iter->data));
+               iter = gtk_size_group_get_widgets (group);
+       }
 }
 
 static WirelessSecurity *