drm/prime: fix sgt NULL checking
The drm_gem_map_detach() can be called with sgt is NULL. Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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The drm_gem_map_detach() can be called with sgt is NULL. Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NDave Airlie <airlied@redhat.com>