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

[Bastien Nocera <hadess src gnome org>]

commit 41bb1a6ff21d91a5229983e51bd25a8e50feefa7
Author: Bastien Nocera <hadess hadess net>
Date:   Tue May 26 13:21:07 2015 +0200

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

 panels/common/cc-common-language.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/common/cc-common-language.c b/panels/common/cc-common-language.c
index 9d68ef2..028213a 100644
--- a/panels/common/cc-common-language.c
+++ b/panels/common/cc-common-language.c
@@ -46,7 +46,7 @@ iter_for_language (GtkTreeModel *model,
         char *name;
         char *language;
 
-        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, LOCALE_COL, &l, -1);
                 if (g_strcmp0 (l, lang) == 0) {