amsg_ctl_desc
struct amsg_ctl_desc buf[16];
struct amsg_ctl_desc *c;
rpos += sizeof(struct amsg_ctl_desc);
sizeof(struct amsg_ctl_desc) :
struct amsg_ctl_desc *desc;
desc = (struct amsg_ctl_desc *)(f->ctldesc + size);
if (f->ctl_desc_size >= offsetof(struct amsg_ctl_desc,