tools, bpftool: Print correct error message when failing to load BTF
btf__parse_raw and btf__parse_elf return negative error numbers wrapped in an ERR_PTR, so the extracted value needs to be negated before passing them to strerror which expects a positive error number. Before: Error: failed to load BTF from .../vmlinux: Unknown error -2 After: Error: failed to load BTF from .../vmlinux: No such file or directory Signed-off-by:Tobias Klauser <tklauser@distanz.ch> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200525135421.4154-1-tklauser@distanz.ch Signed-off-by:
Alexei Starovoitov <ast@kernel.org>
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73a4f040
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