[PATCH -next] drm/arc: Fix some sparse warnings

[Alexey Brodkin]

Hi Wei Yongjun,

On Tue, 2016-07-19 at 12:04 +0000, Wei Yongjun wrote:
> From: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
> 
> Fixes the following sparse warnings:
> 
> drivers/gpu/drm/arc/arcpgu_drv.c:52:5: warning:
>   symbol 'arcpgu_gem_mmap' was not declared. Should it be static?
> drivers/gpu/drm/arc/arcpgu_drv.c:134:48: warning:
>   Using plain integer as NULL pointer
> drivers/gpu/drm/arc/arcpgu_drv.c:155:5: warning:
>   symbol 'arcpgu_unload' was not declared. Should it be static?
> 
> Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>

Acked-by: Alexey Brodkin <abrodkin at synopsys.com>