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Test struct_ops programs returning referenced kptr. When the return type of a struct_ops operator is pointer to struct, the verifier should only allow programs that return a scalar NULL or a non-local kptr with the correct type in its unmodified form. Signed-off-by: Amery Hung <amery.hung@bytedance.com> Acked-by: Eduard Zingerman <eddyz87@gmail.com> Acked-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20250217190640.1748177-6-ameryhung@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>