drm/amdgpu: Add NULL checks for function pointers
Check if function is implemented before making the call. Signed-off-by:Lijo Lazar <lijo.lazar@amd.com> Reviewed-by:
Hawking Zhang <Hawking.Zhang@amd.com> Acked-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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