cli,libmm-glib: provide mm_manager_(peek|get)_proxy()

peek() doesn't increase the reference count of the proxy object, while get()
does it.

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 (mm_manager_get_proxy (ctx->manager));
+    mmcli_force_operation_timeout (mm_manager_peek_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 (mm_manager_get_proxy (ctx->manager));
+    mmcli_force_operation_timeout (mm_manager_peek_proxy (ctx->manager));
 
     /* Request to set log level? */
     if (set_logging_str) {

libmm-glib/mm-manager.c

@@ -131,18 +131,32 @@ mm_manager_new_sync (GDBusConnection                *connection,
     return (ret ? MM_MANAGER (ret) : NULL);
 }
 
+/**
+ * mm_manager_peek_proxy:
+ * @manager: A #MMManager.
+ *
+ * Gets the #GDBusProxy interface of the %manager.
+ *
+ * Returns: (transfer none): The #GDBusProxy interface of %manager. Do not free the returned object, it is owned by @manager.
+ */
+GDBusProxy *
+mm_manager_peek_proxy (MMManager *manager)
+{
+    return G_DBUS_PROXY (manager->priv->manager_iface_proxy);
+}
+
 /**
  * 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.
+ * Returns: (transfer full): The #GDBusProxy interface of %manager, which must be freed with g_object_unref().
  */
 GDBusProxy *
 mm_manager_get_proxy (MMManager *manager)
 {
-    return G_DBUS_PROXY (manager->priv->manager_iface_proxy);
+    return G_DBUS_PROXY (g_object_ref (manager->priv->manager_iface_proxy));
 }
 
 static void

libmm-glib/mm-manager.h

@@ -67,7 +67,8 @@ MMManager *mm_manager_new_sync (
     GCancellable                   *cancellable,
     GError                        **error);
 
-GDBusProxy *mm_manager_get_proxy (MMManager *manager);
+GDBusProxy *mm_manager_peek_proxy (MMManager *manager);
+GDBusProxy *mm_manager_get_proxy  (MMManager *manager);
 
 void mm_manager_set_logging (MMManager           *manager,
                              const gchar         *level,