rcs_lock_remove
int rcs_lock_remove(RCSFILE *, const char *, RCSNUM *);
if ((rcs_lock_remove(pb->file, pb->username, pb->frev) < 0) &&
if (rcs_lock_remove(file, lockname, rev) < 0) {
int rcs_lock_remove(RCSFILE *, const char *, RCSNUM *);
(void)rcs_lock_remove(file, locker, rev);
if (rcs_lock_remove(file, username, rev) == -1 &&