tools: bpftool: add error message on pin failure
No error message is currently printed if the pin syscall itself fails. It got lost in the loadall refactoring. Fixes: 77380998 ("bpftool: add loadall command") Reported-by: NAndy Lutomirski <luto@kernel.org> Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: NQuentin Monnet <quentin.monnet@netronome.com> Acked-by: NAndrii Nakryiko <andriin@fb.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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