staging: r8188eu: remove unused field ptail

The field ptail in struct recv_buf is set but not used.
Remove it.
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/9574ad2dfba0cc444ce1dea1268661ed32b84799.1646321515.git.abdun.nihaal@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/rtl8188eu_recv.c

@@ -16,7 +16,6 @@ void rtl8188eu_init_recvbuf(struct recv_buf *precvbuf)
 {
 	if (precvbuf->pbuf) {
 		precvbuf->pdata = precvbuf->pbuf;
-		precvbuf->ptail = precvbuf->pbuf;
 		precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 	}
 }

drivers/staging/r8188eu/hal/usb_ops_linux.c

@@ -441,12 +441,10 @@ u32 rtw_read_port(struct adapter *adapter, u8 *rmem)
 		skb_reserve(precvbuf->pskb, (RECVBUFF_ALIGN_SZ - alignment));
 
 		precvbuf->pdata = precvbuf->pskb->data;
-		precvbuf->ptail = skb_tail_pointer(precvbuf->pskb);
 		precvbuf->pend = skb_end_pointer(precvbuf->pskb);
 		precvbuf->pbuf = precvbuf->pskb->data;
 	} else { /* reuse skb */
 		precvbuf->pdata = precvbuf->pskb->data;
-		precvbuf->ptail = skb_tail_pointer(precvbuf->pskb);
 		precvbuf->pend = skb_end_pointer(precvbuf->pskb);
 		precvbuf->pbuf = precvbuf->pskb->data;
 

drivers/staging/r8188eu/include/rtw_recv.h

@@ -211,7 +211,6 @@ struct recv_buf {
 	u8	*pbuf;
 	u8	*pallocated_buf;
 	u8	*pdata;
-	u8	*ptail;
 	u8	*pend;
 	struct urb *purb;
 	dma_addr_t dma_transfer_addr;	/* (in) dma addr for transfer_buffer */

drivers/staging/r8188eu/os_dep/recv_linux.c

@@ -27,7 +27,6 @@ int rtw_os_recvbuf_resource_alloc(struct adapter *padapter,
 	precvbuf->pallocated_buf = NULL;
 	precvbuf->pbuf = NULL;
 	precvbuf->pdata = NULL;
-	precvbuf->ptail = NULL;
 	precvbuf->pend = NULL;
 	return res;
 }