staging: r8188eu: remove unused fields in struct recv_buf

The fields alloc_sz, irp_pending and pallocated_buf in struct recv_buf
are set but not used. And the field dma_transfer_addr is not used.
Remove them.
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/d731acb15f82c597de53ecce8fdf1bb82dc4c386.1646321515.git.abdun.nihaal@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/rtl8188eu_recv.c

@@ -38,7 +38,6 @@ int	rtl8188eu_init_recv_priv(struct adapter *padapter)
 	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 
 	for (i = 0; i < NR_RECVBUFF; i++) {
-		precvbuf->alloc_sz = MAX_RECVBUF_SZ;
 		res = rtw_os_recvbuf_resource_alloc(padapter, precvbuf);
 		if (res == _FAIL)
 			break;

drivers/staging/r8188eu/include/rtw_recv.h

@@ -208,11 +208,7 @@ struct sta_recv_priv {
 
 struct recv_buf {
 	struct adapter *adapter;
-	u8	*pallocated_buf;
 	struct urb *purb;
-	dma_addr_t dma_transfer_addr;	/* (in) dma addr for transfer_buffer */
-	u32 alloc_sz;
-	u8  irp_pending;
 	struct sk_buff *pskb;
 	u8	reuse;
 };

drivers/staging/r8188eu/os_dep/recv_linux.c

@@ -18,13 +18,11 @@ int rtw_os_recvbuf_resource_alloc(struct adapter *padapter,
 {
 	int res = _SUCCESS;
 
-	precvbuf->irp_pending = false;
 	precvbuf->purb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!precvbuf->purb)
 		res = _FAIL;
 	precvbuf->pskb = NULL;
 	precvbuf->reuse = false;
-	precvbuf->pallocated_buf = NULL;
 	return res;
 }