staging: r8188eu: use ieee80211 helper for source address

Use the ieee80211_get_SA helper to get a pointer to the source
address of the incoming data frame.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220403165438.357728-2-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_recv.c

@@ -940,13 +940,14 @@ static int validate_recv_data_frame(struct adapter *adapter,
 	u8 *psa, *pda, *pbssid;
 	struct sta_info *psta = NULL;
 	u8 *ptr = precv_frame->rx_data;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)precv_frame->rx_data;
 	struct rx_pkt_attrib	*pattrib = &precv_frame->attrib;
 	struct security_priv	*psecuritypriv = &adapter->securitypriv;
 	int ret = _SUCCESS;
 
 	bretry = GetRetry(ptr);
 	pda = get_da(ptr);
-	psa = get_sa(ptr);
+	psa = ieee80211_get_SA(hdr);
 	pbssid = get_hdr_bssid(ptr);
 
 	if (!pbssid) {