staging: r8188eu: remove unused field phead

The field phead 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/7ff76536af7478a00b300af9a6cb666e53d22aac.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->phead = precvbuf->pbuf;
 		precvbuf->ptail = precvbuf->pbuf;
 		precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 	}

drivers/staging/r8188eu/hal/usb_ops_linux.c

@@ -440,13 +440,11 @@ u32 rtw_read_port(struct adapter *adapter, u8 *rmem)
 		alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
 		skb_reserve(precvbuf->pskb, (RECVBUFF_ALIGN_SZ - alignment));
 
-		precvbuf->phead = precvbuf->pskb->head;
 		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->phead = precvbuf->pskb->head;
 		precvbuf->pdata = precvbuf->pskb->data;
 		precvbuf->ptail = skb_tail_pointer(precvbuf->pskb);
 		precvbuf->pend = skb_end_pointer(precvbuf->pskb);

drivers/staging/r8188eu/include/rtw_recv.h

@@ -210,7 +210,6 @@ struct recv_buf {
 	struct adapter *adapter;
 	u8	*pbuf;
 	u8	*pallocated_buf;
-	u8	*phead;
 	u8	*pdata;
 	u8	*ptail;
 	u8	*pend;

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->phead = NULL;
 	precvbuf->ptail = NULL;
 	precvbuf->pend = NULL;
 	return res;