[PATCH v2] drm/mediatek: stop using 0 as NULL pointer

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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

Fixes: 3df64d7b0a4f ("drm/mediatek: Implement gem prime vmap/vunmap function")
Signed-off-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>

---

Change since v1:
Add Fixes tag

---
 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




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