staging: r8188eu: use ieee80211 helper for protected bit

Use ieee80211_has_protected to check if the "protected" bit is set. Remove
the r8188eu driver's internal macro for this check.

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/20221126154253.178275-6-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme_ext.c

@@ -809,7 +809,7 @@ static void OnAuthClient(struct adapter *padapter, struct recv_frame *precv_fram
 	if (!(pmlmeinfo->state & WIFI_FW_AUTH_STATE))
 		return;
 
-	offset = (GetPrivacy(pframe)) ? 4 : 0;
+	offset = ieee80211_has_protected(hdr->frame_control) ? 4 : 0;
 
 	seq	= le16_to_cpu(*(__le16 *)((size_t)pframe + WLAN_HDR_A3_LEN + offset + 2));
 	status	= le16_to_cpu(*(__le16 *)((size_t)pframe + WLAN_HDR_A3_LEN + offset + 4));

drivers/staging/r8188eu/include/wifi.h

@@ -170,9 +170,6 @@ enum WIFI_REG_DOMAIN {
 #define SetPrivacy(pbuf)	\
 	*(__le16 *)(pbuf) |= cpu_to_le16(_PRIVACY_)
 
-#define GetPrivacy(pbuf)					\
-	(((*(__le16 *)(pbuf)) & cpu_to_le16(_PRIVACY_)) != 0)
-
 #define GetFrameType(pbuf)				\
 	(le16_to_cpu(*(__le16 *)(pbuf)) & (BIT(3) | BIT(2)))