bpf: don't use a negative errno
thread 'main' panicked at [...]libbpf-rs-0.22.1/src/error.rs:334:9: OS error code should be positive integer; got: -7
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thread 'main' panicked at [...]libbpf-rs-0.22.1/src/error.rs:334:9: OS error code should be positive integer; got: -7