brcmfmac: release transmit packet in brcmf_txcomplete()

In the bus-specific driver code each call to brcmf_txcomplete() is
following by a free of that packet. This patch moves that free to
the brcmf_txcomplete() function.

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Piotr Haber <phaber@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/usb.c

@@ -417,8 +417,6 @@ static void brcmf_usb_tx_complete(struct urb *urb)
 	brcmf_usb_del_fromq(devinfo, req);
 
 	brcmf_txcomplete(devinfo->dev, req->skb, urb->status == 0);
-
-	brcmu_pkt_buf_free_skb(req->skb);
 	req->skb = NULL;
 	brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req, &devinfo->tx_freecount);
 	if (devinfo->tx_freecount > devinfo->tx_high_watermark &&