[gtk] gtk-demo: Fix a crash

[Matthias Clasen <matthiasc src gnome org>]

commit dea309144b6a6099c3b6b63a17ab59ed2187ed19
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jul 25 13:47:59 2019 -0400

    gtk-demo: Fix a crash

 demos/gtk-demo/language-names.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/language-names.c b/demos/gtk-demo/language-names.c
index 3cd9142d04..bafb88588a 100644
--- a/demos/gtk-demo/language-names.c
+++ b/demos/gtk-demo/language-names.c
@@ -202,7 +202,7 @@ languages_variant_init (const char *variant)
   else
     g_warning ("Failed to load '%s': %s\n", filename, error->message);
 
-  g_free (error);
+  g_clear_error (&error);
   g_free (filename);
   g_free (buf);
 }