[PATCH] fix sysvipc=n compile

[Oren Laadan]

Pushed this and the recent patches (without net-ns) to ckpt-v20-rc2.
Unless we hit new troubles with this one, I'll fold it and send out.

Oren.

Serge E. Hallyn wrote:
> checkpoint_bad and restore_bad no longer exist, use NULL.
> 
> Signed-off-by: Serge E. Hallyn <serue at us.ibm.com>
> ---
>  include/linux/checkpoint.h |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
> index 8053ca4..792b523 100644
> --- a/include/linux/checkpoint.h
> +++ b/include/linux/checkpoint.h
> @@ -215,8 +215,8 @@ extern void *restore_ipc_ns(struct ckpt_ctx *ctx);
>  extern int ckpt_collect_ipc_ns(struct ckpt_ctx *ctx,
>  			       struct ipc_namespace *ipc_ns);
>  #else
> -#define checkpoint_ipc_ns  checkpoint_bad
> -#define restore_ipc_ns  restore_bad
> +#define checkpoint_ipc_ns  NULL
> +#define restore_ipc_ns  NULL
>  static inline int ckpt_collect_ipc_ns(struct ckpt_ctx *ctx,
>  				      struct ipc_namespace *ipc_ns)
>  {