buffer: add buffer_move_empty
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Reviewed-by: NPeter Lieven <pl@kamp.de> Reviewed-by: NDaniel Berrange <berrange@redhat.com> Message-id: 1446203414-4013-4-git-send-email-kraxel@redhat.com
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