[gimp/gimp-2-8] app: small fix for the previous patch in gimp_group_layer_update_size()

[Michael Natterer <mitch src gnome org>]

commit e44e53a84ba8d9ae56c14b899c070fda1af44f44
Author: Michael Natterer <mitch gimp org>
Date:   Wed Jun 24 19:40:54 2015 +0200

    app: small fix for the previous patch in gimp_group_layer_update_size()
    
    (cherry picked from commit b12ecc71957ec9cfcead2d0757088a1111ae3065)

 app/core/gimpgrouplayer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpgrouplayer.c b/app/core/gimpgrouplayer.c
index e6b1162..bd48525 100644
--- a/app/core/gimpgrouplayer.c
+++ b/app/core/gimpgrouplayer.c
@@ -1133,7 +1133,7 @@ gimp_group_layer_update_size (GimpGroupLayer *group)
                                        x, y, width, height);
 
           /*  see comment in gimp_group_layer_stack_update() below  */
-          gimp_pickable_flush (GIMP_PICKABLE (GET_PRIVATE (group)->projection));
+          gimp_pickable_flush (GIMP_PICKABLE (private->projection));
         }
 
       if (private->offset_node)