[cogl/wip/neil/snippets: 2/26] framebuffer: Fix an unitialized variable

[Neil Roberts <nroberts src gnome org>]

commit 4f66cbb9db2f6be6c5a485a978ac8f7e64e194d3
Author: Neil Roberts <neil linux intel com>
Date:   Tue Nov 29 21:16:36 2011 +0000

    framebuffer: Fix an unitialized variable
    
    The differences variable in _cogl_framebuffer_flush_state was being
    used uninitialized so it would randomly flush extra framebuffer
    state. I wonder why GCC didn't pick up on this?

 cogl/cogl-framebuffer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/cogl/cogl-framebuffer.c b/cogl/cogl-framebuffer.c
index db3e547..f8fc101 100644
--- a/cogl/cogl-framebuffer.c
+++ b/cogl/cogl-framebuffer.c
@@ -1603,7 +1603,7 @@ _cogl_framebuffer_flush_state (CoglFramebuffer *draw_buffer,
 
   /* We can assume that any state that has changed for the current
    * framebuffer is different to the currently flushed value. */
-  differences |= ctx->current_draw_buffer_changes;
+  differences = ctx->current_draw_buffer_changes;
 
   /* Any state of the current framebuffer that hasn't already been
    * flushed is assumed to be unknown so we will always flush that