drm/amd/amdgpu: validate the shadow BO.
Fixes a rare NULL pointer dereference in amdgpu_ttm_bind. The issue was found by Nicolai Haehnle. The patch was tested by Nicolai Haehnle. Signed-off-by: NAlex Xie <AlexBin.Xie@amd.com> Reviewed-by: NChunming Zhou <david1.zhou@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
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