cli,libmm-glib: set default timeout on manager DBus proxy

This patch fixes mmcli to set the default timeout on the manager proxy
interface (MmGdbusOrgFreedesktopModemManager1) instead of MMManager
itself. The later is not a GDBusProxy object.

cli/mmcli-manager.c

@@ -249,7 +249,7 @@ get_manager_ready (GObject      *source,
     ctx->manager = mmcli_get_manager_finish (result);
 
     /* Setup operation timeout */
-    mmcli_force_operation_timeout (G_DBUS_PROXY (ctx->manager));
+    mmcli_force_operation_timeout (mm_manager_get_proxy (ctx->manager));
 
     /* Request to set log level? */
     if (set_logging_str) {
@@ -331,7 +331,7 @@ mmcli_manager_run_synchronous (GDBusConnection *connection)
     ctx->manager = mmcli_get_manager_sync (connection);
 
     /* Setup operation timeout */
-    mmcli_force_operation_timeout (G_DBUS_PROXY (ctx->manager));
+    mmcli_force_operation_timeout (mm_manager_get_proxy (ctx->manager));
 
     /* Request to set log level? */
     if (set_logging_str) {

libmm-glib/mm-manager.c

@@ -131,6 +131,20 @@ mm_manager_new_sync (GDBusConnection                *connection,
     return (ret ? MM_MANAGER (ret) : NULL);
 }
 
+/**
+ * mm_manager_get_proxy:
+ * @manager: A #MMManager.
+ *
+ * Gets the #GDBusProxy interface of the %manager.
+ *
+ * Returns: (transfer none): The #GDBusProxy interface of %manager or %NULL if the interface hasn't been created. Do not free the returned object, it is owned by @manager.
+ */
+GDBusProxy *
+mm_manager_get_proxy (MMManager *manager)
+{
+    return G_DBUS_PROXY (manager->priv->manager_iface_proxy);
+}
+
 static void
 set_logging_ready (MmGdbusOrgFreedesktopModemManager1 *manager_iface_proxy,
                    GAsyncResult                       *res,

libmm-glib/mm-manager.h

@@ -67,6 +67,8 @@ MMManager *mm_manager_new_sync (
     GCancellable                   *cancellable,
     GError                        **error);
 
+GDBusProxy *mm_manager_get_proxy (MMManager *manager);
+
 void mm_manager_set_logging (MMManager           *manager,
                              const gchar         *level,
                              GCancellable        *cancellable,