strset__add_str
off = strset__add_str(btf->strs_set, s);
off = strset__add_str(d->strs_set, s);
err = strset__add_str(d->strs_set, "");
name_off = strset__add_str(linker->strtab_strs, src_sec->sec_name);
name_off = strset__add_str(linker->strtab_strs, sym_name);
name_off = strset__add_str(linker->strtab_strs, sec_name);
str_off = strset__add_str(linker->strtab_strs, sec->sec_name);
str_off = strset__add_str(linker->strtab_strs, sec->sec_name);
int strset__add_str(struct strset *set, const char *s);