libbpf: Return err if bpf_object__load failed
bpf_object__load() has various return code, when it failed to load object, it must return err instead of -EINVAL. Signed-off-by: Mao Wenan <maowenan@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200426063635.130680-3-maowenan@huawei.com
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