staging: vt6656: remove ieee80211_hdr from vnt_usb_send_context.

It is only used in one place were it can be pointed to at skb->data.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/556fab01-aa1e-154e-149e-c04feeb76efa@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/device.h

@@ -238,7 +238,6 @@ struct vnt_rcb {
 struct vnt_usb_send_context {
 	void *priv;
 	struct sk_buff *skb;
-	struct ieee80211_hdr *hdr;
 	void *tx_buffer;
 	unsigned int buf_len;
 	u32 frame_len;

drivers/staging/vt6656/rxtx.c

@@ -73,8 +73,6 @@ static struct vnt_usb_send_context
 		context = priv->tx_context[ii];
 		if (!context->in_use) {
 			context->in_use = true;
-			context->hdr = NULL;
-
 			return context;
 		}
 	}
@@ -392,7 +390,7 @@ static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
 			   struct sk_buff *skb, u16 payload_len,
 			   struct vnt_mic_hdr *mic_hdr)
 {
-	struct ieee80211_hdr *hdr = tx_context->hdr;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	u64 pn64;
 	u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 
@@ -544,7 +542,6 @@ int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 	tx_context->need_ack = false;
 	tx_context->frame_len = skb->len + 4;
 	tx_context->tx_rate =  rate->hw_value;
-	tx_context->hdr = hdr;
 
 	spin_unlock_irqrestore(&priv->lock, flags);