plfxlc_usb_wreq_async
r = plfxlc_usb_wreq_async(&mac->chip.usb, skb->data, skb->len,
plfxlc_usb_wreq_async(usb, skb->data, skb->len, USB_REQ_DATA_TX,
int plfxlc_usb_wreq_async(struct plfxlc_usb *usb, const u8 *buffer,