staging: r8188eu: remove unused field recvbuf_lock

The spinlock field recvbuf_lock in struct recv_buf is initialized but
not used. Remove it.
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/24597a0cc19fa59139bf0a77ccd11a8229d7201f.1646321515.git.abdun.nihaal@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/rtl8188eu_recv.c

@@ -54,7 +54,6 @@ int	rtl8188eu_init_recv_priv(struct adapter *padapter)
 	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 
 	for (i = 0; i < NR_RECVBUFF; i++) {
-		spin_lock_init(&precvbuf->recvbuf_lock);
 		precvbuf->alloc_sz = MAX_RECVBUF_SZ;
 		res = rtw_os_recvbuf_resource_alloc(padapter, precvbuf);
 		if (res == _FAIL)

drivers/staging/r8188eu/include/rtw_recv.h

@@ -207,7 +207,6 @@ struct sta_recv_priv {
 };
 
 struct recv_buf {
-	spinlock_t recvbuf_lock;
 	u32	ref_cnt;
 	struct adapter *adapter;
 	u8	*pbuf;