[cogl] renderer: add missing transfer annotation

[Robert Bragg <rbragg src gnome org>]

commit 52711d154d1d5fa12bf8a37e30d835fa77dde85c
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Tue Sep 3 14:07:19 2013 +0100

    renderer: add missing transfer annotation
    
    Reviewed-by: Robert Bragg <robert linux intel com>
    
    (cherry picked from commit c042051c012ff6074d83cab6f1567e2db7b344f9)

 cogl/cogl-renderer.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl-renderer.h b/cogl/cogl-renderer.h
index a3b4fc2..b98c756 100644
--- a/cogl/cogl-renderer.h
+++ b/cogl/cogl-renderer.h
@@ -129,6 +129,8 @@ cogl_is_renderer (void *object);
  * so Cogl will automatically connect and setup a renderer and
  * display.</note>
  *
+ * Return value: (transfer full): A newly created #CoglRenderer.
+ *
  * Since: 1.10
  * Stability: unstable
  */