[gegl] gegl: improve GIR annotation of gegl_processor_get_buffer

[Øyvind "pippin" Kolås <ok src gnome org>]

commit aa812ff3f9e4d8b72af87fcde6cfaa286aa2db2e
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Aug 4 20:51:07 2019 +0200

    gegl: improve GIR annotation of gegl_processor_get_buffer

 gegl/process/gegl-processor.h | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gegl/process/gegl-processor.h b/gegl/process/gegl-processor.h
index a809e12e0..639524fc0 100644
--- a/gegl/process/gegl-processor.h
+++ b/gegl/process/gegl-processor.h
@@ -85,6 +85,8 @@ gboolean       gegl_processor_work          (GeglProcessor *processor,
  * Returns the (cache) buffer the processor is rendering into, another way of
  * getting to the same pixel data is calling gegl_node_blit with flags
  * indicating that we want caching and accept dirty data.
+ *
+ * Return value: (transfer full): the #GeglBuffer rendered into.
  */
 
 GeglBuffer *gegl_processor_get_buffer (GeglProcessor *processor);