staging: r8188eu: terminate_xmitthread_sema is not used

Remove terminate_xmitthread_sema from struct xmit_priv. This semaphore is
initialised but not used.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221230180646.91008-16-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_xmit.c

@@ -69,7 +69,6 @@ int _rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 	/*  We don't need to memset padapter->XXX to zero, because adapter is allocated by vzalloc(). */
 
 	spin_lock_init(&pxmitpriv->lock);
-	sema_init(&pxmitpriv->terminate_xmitthread_sema, 0);
 
 	/*
 	 * Please insert all the queue initializaiton using rtw_init_queue below

drivers/staging/r8188eu/include/rtw_xmit.h

@@ -257,7 +257,6 @@ struct agg_pkt_info {
 
 struct	xmit_priv {
 	spinlock_t lock;
-	struct semaphore terminate_xmitthread_sema;
 	struct __queue be_pending;
 	struct __queue bk_pending;
 	struct __queue vi_pending;