[gtk] font button: Fix a crash

[Matthias Clasen <matthiasc src gnome org>]

commit ec66c32deffda6104ee8f1efc4ccd8839d703d9f
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Apr 2 17:45:48 2018 -0400

    font button: Fix a crash
    
    Since we are now storing the language as a PangoLanguage,
    we must not free it anymore.

 gtk/gtkfontbutton.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index 6c06029bf8..21c244681e 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -1005,8 +1005,7 @@ response_cb (GtkDialog *dialog,
   priv->font_size = gtk_font_chooser_get_font_size (font_chooser);
   g_free (priv->font_features);
   priv->font_features = gtk_font_chooser_get_font_features (font_chooser);
-  g_free (priv->language);
-  priv->language = gtk_font_chooser_get_language (font_chooser);
+  priv->language = pango_language_from_string (gtk_font_chooser_get_language (font_chooser));
 
   /* Set label font */
   gtk_font_button_update_font_info (font_button);