funsetfd_locked
static struct file *funsetfd_locked (struct filedesc *fdp, int fd);
if ((fp = funsetfd_locked(fdp, fd)) == NULL) {
(void)funsetfd_locked(newfdp, i);
fp = funsetfd_locked(fdp, i);
if ((fp = funsetfd_locked(fdp, i)) != NULL) {
if ((fp = funsetfd_locked(fdp, i)) != NULL) {