selftests/bpf: Fix unused attribute usage in subprogs_unused test
Correct attribute name is "unused". maybe_unused is a C++17 addition. This patch fixes compilation warning during selftests compilation. Fixes: 197afc63 ("libbpf: Don't attempt to load unused subprog as an entry-point BPF program") Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20201111231215.1779147-1-andrii@kernel.org
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