drm/amdgpu: Plus NULL function pointer check
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NEvan Quan <evan.quan@amd.com> Signed-off-by: NRex Zhu <Rex.Zhu@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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