[gtk/wip/sadiq/fixes] aboutdialog: Fix memory leak

[Mohammed Sadiq <pksadiq src gnome org>]

commit d6abaad7cb4a566da137dfeecf9a63ffb259e546
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Sun May 13 10:59:34 2018 +0530

    aboutdialog: Fix memory leak

 gtk/gtkaboutdialog.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/gtkaboutdialog.c b/gtk/gtkaboutdialog.c
index 49d890dddf..57e8485740 100644
--- a/gtk/gtkaboutdialog.c
+++ b/gtk/gtkaboutdialog.c
@@ -801,6 +801,7 @@ gtk_about_dialog_finalize (GObject *object)
   g_free (priv->website_url);
   g_free (priv->website_text);
   g_free (priv->translator_credits);
+  g_free (priv->system_information);
 
   g_strfreev (priv->authors);
   g_strfreev (priv->documenters);
@@ -1371,6 +1372,7 @@ gtk_about_dialog_set_system_information (GtkAboutDialog *about,
 
   priv = about->priv;
 
+  g_free (priv->system_information);
   priv->system_information = g_strdup (system_information);
   update_system_button_visibility (about);