[v2] xen: netback: fix printf format string warning

drivers/net/xen-netback/netback.c: In function ‘xenvif_tx_build_gops’:
drivers/net/xen-netback/netback.c:1253:8: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘int’ [-Wformat=]
        (txreq.offset&~PAGE_MASK) + txreq.size);
        ^

PAGE_MASK's type can vary by arch, so a cast is needed.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
----
v2: Cast to unsigned long, since PAGE_MASK can vary by arch.
---
 drivers/net/xen-netback/netback.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

On Mon, Jun 01, 2015 at 11:30:04AM +0100, Ian Campbell wrote:
> drivers/net/xen-netback/netback.c: In function ‘xenvif_tx_build_gops’:
> drivers/net/xen-netback/netback.c:1253:8: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘int’ [-Wformat=]
>         (txreq.offset&~PAGE_MASK) + txreq.size);
>         ^
> 
> PAGE_MASK's type can vary by arch, so a cast is needed.
> 
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

Acked-by: Wei Liu <wei.liu2@citrix.com>

> ----
> v2: Cast to unsigned long, since PAGE_MASK can vary by arch.
> ---
>  drivers/net/xen-netback/netback.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
> index 4de46aa..0d25943 100644
> --- a/drivers/net/xen-netback/netback.c
> +++ b/drivers/net/xen-netback/netback.c
> @@ -1250,7 +1250,7 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
>  			netdev_err(queue->vif->dev,
>  				   "txreq.offset: %x, size: %u, end: %lu\n",
>  				   txreq.offset, txreq.size,
> -				   (txreq.offset&~PAGE_MASK) + txreq.size);
> +				   (unsigned long)(txreq.offset&~PAGE_MASK) + txreq.size);
>  			xenvif_fatal_tx_err(queue->vif);
>  			break;
>  		}
> -- 
> 1.7.10.4
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