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FUNCs do not have sizes, thus currently btf__resolve_size will fail with -EINVAL. Add conditions so that we only update size when the BTF object is not function or function prototype. Signed-off-by: Eric Long <i@hack3r.moe> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20241002-libbpf-dup-extern-funcs-v4-1-560eb460ff90@hack3r.moe