iwi_hdr
m->m_pkthdr.len = m->m_len = sizeof (struct iwi_hdr) +
m_adj(m, sizeof (struct iwi_hdr) + sizeof (struct iwi_frame));
struct iwi_hdr *hdr;
hdr = mtod(data->m, struct iwi_hdr *);
struct iwi_hdr hdr;
struct iwi_hdr hdr;