broadband-modem: port modem_3gpp_ussd_{setup,cleanup}_unsolicited_result_codes to use GTask

src/mm-broadband-modem.c

@@ -4901,7 +4901,7 @@ modem_3gpp_ussd_setup_cleanup_unsolicited_result_codes_finish (MMIfaceModem3gppU
                                                                GAsyncResult *res,
                                                                GError **error)
 {
-    return !g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error);
+    return g_task_propagate_boolean (G_TASK (res), error);
 }
 
 static gchar *
@@ -5086,15 +5086,10 @@ set_unsolicited_result_code_handlers (MMIfaceModem3gppUssd *self,
                                       GAsyncReadyCallback callback,
                                       gpointer user_data)
 {
-    GSimpleAsyncResult *result;
     MMPortSerialAt *ports[2];
     GRegex *cusd_regex;
     guint i;
-
-    result = g_simple_async_result_new (G_OBJECT (self),
-                                        callback,
-                                        user_data,
-                                        set_unsolicited_events_handlers);
+    GTask *task;
 
     cusd_regex = mm_3gpp_cusd_regex_get ();
     ports[0] = mm_base_modem_peek_port_primary (MM_BASE_MODEM (self));
@@ -5117,9 +5112,10 @@ set_unsolicited_result_code_handlers (MMIfaceModem3gppUssd *self,
     }
 
     g_regex_unref (cusd_regex);
-    g_simple_async_result_set_op_res_gboolean (result, TRUE);
-    g_simple_async_result_complete_in_idle (result);
-    g_object_unref (result);
+
+    task = g_task_new (self, NULL, callback, user_data);
+    g_task_return_boolean (task, TRUE);
+    g_object_unref (task);
 }
 
 static void