staging: rtl8188eu: use safe iterator in wakeup_sta_to_xmit()

These two loops call list_del_init() on the list iterator so they need to
use the _safe() iterator to prevent a forever loop.

Fixes: 23017c88 ("staging: rtl8188eu: Use list iterators and helpers")
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YL5i1ZAAAB4vSWef@mwandaSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_xmit.c

@@ -1796,17 +1796,14 @@ void wakeup_sta_to_xmit(struct adapter *padapter, struct sta_info *psta)
 {
 	u8 update_mask = 0, wmmps_ac = 0;
 	struct sta_info *psta_bmc;
-	struct list_head *xmitframe_plist, *xmitframe_phead;
-	struct xmit_frame *pxmitframe = NULL;
+	struct list_head *xmitframe_phead;
+	struct xmit_frame *pxmitframe, *n;
 	struct sta_priv *pstapriv = &padapter->stapriv;
 
 	spin_lock_bh(&psta->sleep_q.lock);
 
 	xmitframe_phead = get_list_head(&psta->sleep_q);
-	list_for_each(xmitframe_plist, xmitframe_phead) {
-		pxmitframe = list_entry(xmitframe_plist, struct xmit_frame,
-					list);
-
+	list_for_each_entry_safe(pxmitframe, n, xmitframe_phead, list) {
 		list_del_init(&pxmitframe->list);
 
 		switch (pxmitframe->attrib.priority) {
@@ -1881,10 +1878,7 @@ void wakeup_sta_to_xmit(struct adapter *padapter, struct sta_info *psta)
 		spin_lock_bh(&psta_bmc->sleep_q.lock);
 
 		xmitframe_phead = get_list_head(&psta_bmc->sleep_q);
-		list_for_each(xmitframe_plist, xmitframe_phead) {
-			pxmitframe = list_entry(xmitframe_plist,
-						struct xmit_frame, list);
-
+		list_for_each_entry_safe(pxmitframe, n, xmitframe_phead, list) {
 			list_del_init(&pxmitframe->list);
 
 			psta_bmc->sleepq_len--;