staging: vt6656: rxtx remove unused need_ack

need_ack is no longer used by driver remove it.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/f19dfbde-23a6-ba79-d988-576d2e3bcf62@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/device.h

@@ -246,7 +246,6 @@ struct vnt_usb_send_context {
 	u8 type;
 	u8 pkt_no;
 	u8 pkt_type;
-	u8 need_ack;
 	bool in_use;
 };
 

drivers/staging/vt6656/rxtx.c

@@ -539,7 +539,6 @@ int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 
 	tx_context->skb = skb;
 	tx_context->pkt_type = pkt_type;
-	tx_context->need_ack = false;
 	tx_context->frame_len = skb->len + 4;
 	tx_context->tx_rate =  rate->hw_value;
 
@@ -587,10 +586,8 @@ int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 			cpu_to_le16(DEFAULT_MSDU_LIFETIME_RES_64us);
 	}
 
-	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
+	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 		tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_NEEDACK);
-		tx_context->need_ack = true;
-	}
 
 	if (ieee80211_has_retry(hdr->frame_control))
 		tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LRETRY);