vidtv_psi_desc_assign
vidtv_psi_desc_assign(&tail->descriptor, desc);
vidtv_psi_desc_assign(&tail->descriptor, desc);
vidtv_psi_desc_assign(&tail->descriptor,
vidtv_psi_desc_assign(to, desc);
vidtv_psi_desc_assign(to, NULL);
vidtv_psi_desc_assign(to, desc);
vidtv_psi_desc_assign(to, NULL);
void vidtv_psi_desc_assign(struct vidtv_psi_desc **to,