staging: r8188eu: replace a GetAddr1Ptr call

Define a struct ieee80211_mgmt and use it to read the destination address.

This replaces one call to the driver-specific GetAddr1Ptr function, which
should eventually be removed.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20221030173326.1588647-2-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme_ext.c

@@ -3815,13 +3815,14 @@ static unsigned int on_action_public_default(struct recv_frame *precv_frame)
 
 unsigned int on_action_public(struct adapter *padapter, struct recv_frame *precv_frame)
 {
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)precv_frame->rx_data;
 	unsigned int ret = _FAIL;
 	u8 *pframe = precv_frame->rx_data;
 	u8 *frame_body = pframe + sizeof(struct ieee80211_hdr_3addr);
 	u8 category, action;
 
 	/* check RA matches or not */
-	if (memcmp(myid(&padapter->eeprompriv), GetAddr1Ptr(pframe), ETH_ALEN))
+	if (memcmp(myid(&padapter->eeprompriv), mgmt->da, ETH_ALEN))
 		goto exit;
 
 	category = frame_body[0];