[cogl/cogl-1.20] framebuffer-deprecated: Unref the correct buffer

[Rui Matos <rtcm src gnome org>]

commit eb87ad165cefe0815fe22217d0f2c31a251c8bb4
Author: Rui Matos <tiagomatos gmail com>
Date:   Fri May 8 15:30:41 2015 +0200

    framebuffer-deprecated: Unref the correct buffer
    
    Looks like a thinko introduced by commit
    79719347c879f675de92f1fe097de1c4b5f71116 .
    
    Found by a coverity scan.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749111

 cogl/deprecated/cogl-framebuffer-deprecated.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/cogl/deprecated/cogl-framebuffer-deprecated.c b/cogl/deprecated/cogl-framebuffer-deprecated.c
index 19f3ee4..97a2a0a 100644
--- a/cogl/deprecated/cogl-framebuffer-deprecated.c
+++ b/cogl/deprecated/cogl-framebuffer-deprecated.c
@@ -78,7 +78,7 @@ _cogl_free_framebuffer_stack (GSList *stack)
         cogl_object_unref (entry->draw_buffer);
 
       if (entry->read_buffer)
-        cogl_object_unref (entry->draw_buffer);
+        cogl_object_unref (entry->read_buffer);
 
       g_slice_free (CoglFramebufferStackEntry, entry);
     }