selftests/bpf: add missing pointer dereference for map stacktrace fixup
I get a segfault without it, other fixups always do dereference, and without dereference I don't understand how it can ever work. Fixes: 7c85c448 ("selftests/bpf: test_verifier, check bpf_map_lookup_elem access in bpf prog") Signed-off-by: NStanislav Fomichev <sdf@google.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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