staging: wfx: remove misused call to cpu_to_le16()

Indeed, hif_msg->id is a uint8_t, so use of cpu_to_le16() is a madness.

Fixes: 9bca45f3 ("staging: wfx: allow to send 802.11 frames")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191008094232.10014-3-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/data_tx.c

@@ -620,7 +620,7 @@ static int wfx_tx_inner(struct wfx_vif *wvif, struct ieee80211_sta *sta, struct
 	memset(skb->data, 0, wmsg_len);
 	hif_msg = (struct hif_msg *) skb->data;
 	hif_msg->len = cpu_to_le16(skb->len);
-	hif_msg->id = cpu_to_le16(HIF_REQ_ID_TX);
+	hif_msg->id = HIF_REQ_ID_TX;
 	hif_msg->interface = wvif->id;
 	if (skb->len > wvif->wdev->hw_caps.size_inp_ch_buf) {
 		dev_warn(wvif->wdev->dev, "requested frame size (%d) is larger than maximum supported (%d)\n",