[gnome-control-center] printers: Don't pass PpSamba references around

[Robert Ancell <rancell src gnome org>]

commit 7ebf0f22aa2b4d8ae9153e310ea77dd7c8911822
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Jun 26 17:01:01 2020 +1200

    printers: Don't pass PpSamba references around
    
    An internal GTask will hold a reference to it for the duration of the async calls.

 panels/printers/pp-new-printer-dialog.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)
---
diff --git a/panels/printers/pp-new-printer-dialog.c b/panels/printers/pp-new-printer-dialog.c
index 04b6b0469..e17e36ce5 100644
--- a/panels/printers/pp-new-printer-dialog.c
+++ b/panels/printers/pp-new-printer-dialog.c
@@ -248,13 +248,9 @@ get_authenticated_samba_devices_cb (GObject      *source_object,
   PpNewPrinterDialog        *self = PP_NEW_PRINTER_DIALOG (data->dialog);
   g_autoptr(GPtrArray)       devices = NULL;
   gboolean                   cancelled = FALSE;
-  PpSamba                   *samba = (PpSamba *) source_object;
   g_autoptr(GError)          error = NULL;
 
-  g_object_ref (samba);
-
-  devices = pp_samba_get_devices_finish (samba, res, &error);
-  g_object_unref (source_object);
+  devices = pp_samba_get_devices_finish (PP_SAMBA (source_object), res, &error);
 
   if (devices != NULL)
     {
@@ -546,6 +542,7 @@ pp_new_printer_dialog_finalize (GObject *object)
   g_clear_object (&self->local_printer_icon);
   g_clear_object (&self->remote_printer_icon);
   g_clear_object (&self->authenticated_server_icon);
+  g_clear_object (&self->samba_host);
 
   if (self->num_of_dests > 0)
     {
@@ -1131,16 +1128,13 @@ get_samba_host_devices_cb (GObject      *source_object,
 {
   PpNewPrinterDialog        *self = user_data;
   g_autoptr(GPtrArray)       devices = NULL;
-  PpSamba                   *samba = (PpSamba *) source_object;
   g_autoptr(GError)          error = NULL;
 
-  devices = pp_samba_get_devices_finish (samba, res, &error);
-  g_object_unref (source_object);
+  devices = pp_samba_get_devices_finish (PP_SAMBA (source_object), res, &error);
 
   if (devices != NULL)
     {
-      if ((gpointer) source_object == (gpointer) self->samba_host)
-        self->samba_host = NULL;
+      g_clear_object(&self->samba_host);
 
       add_devices_to_list (self, devices);
 
@@ -1152,8 +1146,7 @@ get_samba_host_devices_cb (GObject      *source_object,
         {
           g_warning ("%s", error->message);
 
-          if ((gpointer) source_object == (gpointer) self->samba_host)
-            self->samba_host = NULL;
+          g_clear_object(&self->samba_host);
 
           update_dialog_state (self);
         }
@@ -1167,11 +1160,9 @@ get_samba_devices_cb (GObject      *source_object,
 {
   PpNewPrinterDialog        *self = user_data;
   g_autoptr(GPtrArray)       devices = NULL;
-  PpSamba                   *samba = (PpSamba *) source_object;
   g_autoptr(GError)          error = NULL;
 
-  devices = pp_samba_get_devices_finish (samba, res, &error);
-  g_object_unref (source_object);
+  devices = pp_samba_get_devices_finish (PP_SAMBA (source_object), res, &error);
 
   if (devices != NULL)
     {
@@ -1828,7 +1819,7 @@ static void
 populate_devices_list (PpNewPrinterDialog *self)
 {
   GtkTreeViewColumn         *column;
-  PpSamba                   *samba;
+  g_autoptr(PpSamba)         samba = NULL;
   g_autoptr(GEmblem)         emblem = NULL;
   PpCups                    *cups;
   g_autoptr(GIcon)           icon = NULL;