From f9d8a1294d37449f3f1b842ffb275e2ca41f5cf4 Mon Sep 17 00:00:00 2001
From: Joonyoung Shim <jy0922.shim@samsung.com>
Date: Thu, 4 Jul 2013 16:19:12 +0900
Subject: [PATCH] drm/prime: fix sgt NULL checking

The drm_gem_map_detach() can be called with sgt is NULL.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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