drm/tegra: dc: Using NULL instead of plain integer
Fixes the following sparse warnings: drivers/gpu/drm/tegra/dc.c:2181:69: warning: Using plain integer as NULL pointer Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
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