[gtk+] icon helper: Avoid a few string copies

[Matthias Clasen <matthiasc src gnome org>]

commit 7c4a1a596f601516b6377d666a205e1a007c4822
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 17 23:21:24 2017 -0500

    icon helper: Avoid a few string copies

 gtk/gtkiconhelper.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkiconhelper.c b/gtk/gtkiconhelper.c
index 902998b..ab42bb9 100644
--- a/gtk/gtkiconhelper.c
+++ b/gtk/gtkiconhelper.c
@@ -631,8 +631,8 @@ gtk_icon_size_set_style_classes (GtkCssNode  *cssnode,
   for (i = 0; i < G_N_ELEMENTS (class_names); i++)
     {
       if (icon_size == class_names[i].icon_size)
-        gtk_css_node_add_class (cssnode, g_quark_from_string (class_names[i].class_name));
+        gtk_css_node_add_class (cssnode, g_quark_from_static_string (class_names[i].class_name));
       else
-        gtk_css_node_remove_class (cssnode, g_quark_from_string (class_names[i].class_name));
+        gtk_css_node_remove_class (cssnode, g_quark_from_static_string (class_names[i].class_name));
     }
 }