[gnome-control-center/gnome-3-38] printers: Fix string leaks in new printer dialog

[Robert Ancell <rancell src gnome org>]

commit 5cbc30cc1b81669d24142c4d27afe6adfe940e3d
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Nov 10 15:03:47 2020 +1300

    printers: Fix string leaks in new printer dialog

 panels/printers/pp-new-printer-dialog.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/panels/printers/pp-new-printer-dialog.c b/panels/printers/pp-new-printer-dialog.c
index 8ff3050f3..7ace4d743 100644
--- a/panels/printers/pp-new-printer-dialog.c
+++ b/panels/printers/pp-new-printer-dialog.c
@@ -1938,8 +1938,8 @@ ppd_selection_cb (GtkDialog *_dialog,
   PpNewPrinterDialog        *self = user_data;
   PpNewPrinter              *new_printer;
   GList                     *original_names_list = NULL;
-  gchar                     *ppd_name;
-  gchar                     *ppd_display_name;
+  g_autofree gchar          *ppd_name = NULL;
+  g_autofree gchar          *ppd_display_name = NULL;
   guint                      window_id = 0;
   gint                       acquisition_method;