[gnome-control-center] user-accounts: Fix gtk_tree_model_get_iter_first() retval

[Bastien Nocera <hadess src gnome org>]

commit 93414609faa8d506c43392fe80bb549a36471afa
Author: Bastien Nocera <hadess hadess net>
Date:   Tue May 26 13:22:12 2015 +0200

    user-accounts: Fix gtk_tree_model_get_iter_first() retval
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749892

 panels/user-accounts/um-user-panel.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/panels/user-accounts/um-user-panel.c b/panels/user-accounts/um-user-panel.c
index d995ea7..e2d164c 100644
--- a/panels/user-accounts/um-user-panel.c
+++ b/panels/user-accounts/um-user-panel.c
@@ -349,7 +349,7 @@ user_changed (ActUserManager *um, ActUser *user, CcUserPanelPrivate *d)
         model = gtk_tree_view_get_model (tv);
         selection = gtk_tree_view_get_selection (tv);
 
-        gtk_tree_model_get_iter_first (model, &iter);
+        g_assert (gtk_tree_model_get_iter_first (model, &iter));
         do {
                 gtk_tree_model_get (model, &iter, USER_COL, &current, -1);
                 if (current == user) {
@@ -409,7 +409,7 @@ select_created_user (GObject *object,
         selection = gtk_tree_view_get_selection (tv);
         user_uid = act_user_get_uid (user);
 
-        gtk_tree_model_get_iter_first (model, &iter);
+        g_assert (gtk_tree_model_get_iter_first (model, &iter));
         do {
                 gtk_tree_model_get (model, &iter, USER_COL, &current, -1);
                 if (current) {