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[ Upstream commit956fcfcd35] Fix pass 0 to PTR_ERR, also dump more err info using libbpf_strerror. Fixes:5dc7a8b211("bpftool, selftests/bpf: Embed object file inside skeleton") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Reviewed-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20200717123059.29624-1-yuehaibing@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>