[PATCH] drm/mediatek: stop using 0 as NULL pointer

[Miles Chen]

Use NULL for NULL pointer to fix the following sparse warning:
drivers/gpu/drm/mediatek/mtk_drm_gem.c:265:27: sparse: warning: Using plain 
integer as NULL pointer

Signed-off-by: Miles Chen <miles.c...@mediatek.com>

---
 drivers/gpu/drm/mediatek/mtk_drm_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c 
b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index 47e96b0289f9..06aadd5e7f5b 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -262,6 +262,6 @@ void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
                return;
 
        vunmap(vaddr);
-       mtk_gem->kvaddr = 0;
+       mtk_gem->kvaddr = NULL;
        kfree(mtk_gem->pages);
 }
-- 
2.18.0