tools/bpftool: Remove warning about PID iterator support
Don't emit warning that bpftool was built without PID iterator support. This error garbles JSON output of otherwise perfectly valid show commands. Reported-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200710232605.20918-1-andriin@fb.com
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