m_append
if (!m_append(*m_head, min(n, sizeof(pad)), pad))
int m_append(struct mbuf*, int, c_caddr_t);
return m_append(m0, ccmp_get_trailer_len(key), b);
(void) m_append(m, IEEE80211_WEP_CRCLEN, icv); /* XXX check return */
return m_append(m, tkip.ic_miclen, mic);
return m_append(m0, IEEE80211_WEP_CRCLEN, icv);