staging:r8188eu: replace rx_end member of recv_frame with pkt->end

rx_end is duplication of pkt->end pointer.
pkt->end is preferred, because it is native skb field
supported by skb_*() functions.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/include/rtw_recv.h

@@ -231,7 +231,6 @@ struct recv_frame {
 	uint  len;
 	u8 *rx_data;
 	u8 *rx_tail;
-	u8 *rx_end;
 	struct sta_info *psta;
 	/* for A-MPDU Rx reordering buffer control */
 	struct recv_reorder_ctrl *preorder_ctrl;
@@ -282,7 +281,7 @@ static inline u8 *recvframe_put(struct recv_frame *precvframe, int sz)
 
 	precvframe->rx_tail += sz;
 
-	if (precvframe->rx_tail > precvframe->rx_end) {
+	if (precvframe->rx_tail > precvframe->pkt->end) {
 		precvframe->rx_tail -= sz;
 		return NULL;
 	}

drivers/staging/rtl8188eu/os_dep/usb_ops_linux.c

@@ -125,7 +125,6 @@ static int recvbuf2recvframe(struct adapter *adapt, struct sk_buff *pskb)
 		if (pkt_copy) {
 			pkt_copy->dev = adapt->pnetdev;
 			precvframe->pkt = pkt_copy;
-			precvframe->rx_end = pkt_copy->data + alloc_sz;
 			skb_reserve(pkt_copy, 8 - ((size_t)(pkt_copy->data) & 7));/* force pkt_copy->data at 8-byte alignment address */
 			skb_reserve(pkt_copy, shift_sz);/* force ip_hdr at 8-byte alignment address according to shift_sz. */
 			memcpy(pkt_copy->data, (pbuf + pattrib->drvinfo_sz + RXDESC_SIZE), skb_len);