drm/amdgpu: Remove unnecessary NULL check
container_of cannot return NULL, so it is unnecessary to check for
NULL after gem_to_amdgpu_bo, which is just a container_of call
Signed-off-by: Kent Russell <kent.russell@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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