[gnome-control-center] printers: Fix location where GTask is unreffed

[Robert Ancell <rancell src gnome org>]

commit f8204635ce42f4d6eb0aa578cf435e466a075e03
Author: Robert Ancell <robert ancell canonical com>
Date:   Sat Jun 27 10:46:47 2020 +1200

    printers: Fix location where GTask is unreffed

 panels/printers/pp-printer.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/panels/printers/pp-printer.c b/panels/printers/pp-printer.c
index 2d78ee531..081d29319 100644
--- a/panels/printers/pp-printer.c
+++ b/panels/printers/pp-printer.c
@@ -203,7 +203,7 @@ get_bus_cb (GObject      *source_object,
 {
   GDBusConnection  *bus;
   g_autoptr(GError) error = NULL;
-  GTask            *task = user_data;
+  g_autoptr(GTask)  task = user_data;
 
   bus = g_bus_get_finish (res, &error);
   if (bus != NULL)
@@ -261,7 +261,6 @@ pp_printer_rename_finish (PpPrinter     *self,
                           GError       **error)
 {
   g_return_val_if_fail (g_task_is_valid (res, self), FALSE);
-  g_object_unref (res);
 
   return g_task_propagate_boolean (G_TASK (res), error);
 }