[Beignet] [PATCH] Don't crash if device inaccessible

[Zhigang Gong]

LGTM, will push latter, thanks.

On Sat, Mar 21, 2015 at 07:37:00AM +0000, Rebecca N. Palmer wrote:
> If /dev/dri/cardX is inaccessible, return CL_DEVICE_NOT_FOUND,
> don't assert-fail.
> 
> Signed-off-by: Rebecca Palmer <rebecca_palmer at zoho.com>
> 
> diff --git a/src/x11/dricommon.c b/src/x11/dricommon.c
> index 03f542c..16f50e4 100644
> --- a/src/x11/dricommon.c
> +++ b/src/x11/dricommon.c
> @@ -284,7 +284,6 @@ getDRI2State(Display* dpy, int screen, char **driver_name)
>      goto err_out;
>    fd = open(device_name, O_RDWR);
> -  assert(fd >= 0);
>    if (fd < 0)
>      goto err_out;
> 
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