parse_btf_map_def
err = parse_btf_map_def(inner_map_name, btf, t, strict, inner_def, NULL);
err = parse_btf_map_def(map->name, obj->btf, def, strict, &map_def, &inner_def);
int parse_btf_map_def(const char *map_name, struct btf *btf,
err = parse_btf_map_def(sym_name, obj->btf, t, true /*strict*/, &src_def, &src_inner_def);
err = parse_btf_map_def(sym_name, linker->btf, t, true /*strict*/, &dst_def, &dst_inner_def);