staging/rtl8192u: convert skb->tail into skb_tail_pointer(skb)

The change set of 7a884dc "[SK_BUFF]: Convert skb->tail to sk_buff_data_t"
converted skb->tail from pointer into sk_buff_data_t.
Thus skb->tail is not always pointer, the area pointed by skb->tail
should be accessed via skb_tail_pointer().

Found by inspection. Compile tested only.

Cc: Simon Horman <horms@verge.net.au>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Reviewed-by: Simon Horman <horms@verge.net.au>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/staging/rtl8192u/r8192U_core.c

@@ -1271,8 +1271,8 @@ struct sk_buff *DrvAggr_Aggregation(struct net_device *dev, struct ieee80211_drv
 		/* Subframe drv Tx descriptor and firmware info setting */
 		skb = pSendList->tx_agg_frames[i];
 		tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
-		tx_agg_desc = (tx_desc_819x_usb_aggr_subframe *)agg_skb->tail;
-		tx_fwinfo = (tx_fwinfo_819x_usb *)(agg_skb->tail + sizeof(tx_desc_819x_usb_aggr_subframe));
+		tx_agg_desc = (tx_desc_819x_usb_aggr_subframe *)skb_tail_pointer(agg_skb);
+		tx_fwinfo = (tx_fwinfo_819x_usb *)(skb_tail_pointer(agg_skb) + sizeof(tx_desc_819x_usb_aggr_subframe));
 
 		memset(tx_fwinfo,0,sizeof(tx_fwinfo_819x_usb));
 		/* DWORD 0 */