ctf_merge_add
if ((err = ctf_merge_add(cmh, fp)) != 0) {
if ((ret = ctf_merge_add(cup->cu_cmh, cup->cu_ctfp)) != 0) {
if ((err = ctf_merge_add(cmp, fpprev)) != 0) {
if ((err = ctf_merge_add(cmp, cup->cu_ctfp)) != 0) {
extern int ctf_merge_add(ctf_merge_t *, ctf_file_t *);