From 37826519c4dca037bda5d008b4d687c2e6f8d405 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@nvidia.com>
Date: Fri, 8 Nov 2013 12:30:37 +0100
Subject: [PATCH] drm/tegra: Make CRTC upcasting safer

When upcasting a NULL CRTC object, propagate the NULL pointer instead of
some invalid pointer. This allows subsequent code to check that the cast
object is valid.

Signed-off-by: Thierry Reding <treding@nvidia.com>
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