Block execbuffer for the fb to be flipped away, not the one that is to
be flipped in.

[ickle: rewritten for -next]
Signed-off-by: NChia-I Wu <olvaffe@gmail.com>
Acked-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: NKristian Høgsberg <krh@bitplanet.net>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>