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Adding the test to re-attach (detach/attach again) tracing fexit programs, plus check that already linked program can't be attached again. Also switching to ASSERT* macros. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210414195147.1624932-5-jolsa@kernel.org