staging: r8188eu: Fix a resource leak in update_bcn_wps_ie

The "pbackup_remainder_ie" variable is not freed when "pwps_ie_src" is null

Fixes: 15865124fe ("staging: r8188eu: introduce new core dir for RTL8188eu driver")
Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Xiangyang Zhang <xyz.sun.ok@gmail.com>
Link: https://lore.kernel.org/r/20210821081824.14745-1-xyz.sun.ok@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_ap.c

@@ -1199,7 +1199,7 @@ static void update_bcn_wps_ie(struct adapter *padapter)
 
 	pwps_ie_src = pmlmepriv->wps_beacon_ie;
 	if (!pwps_ie_src)
-		return;
+		goto exit;
 
 	wps_ielen = (uint)pwps_ie_src[1];/* to get ie data len */
 	if ((wps_offset + wps_ielen + 2 + remainder_ielen) <= MAX_IE_SZ) {
@@ -1213,6 +1213,7 @@ static void update_bcn_wps_ie(struct adapter *padapter)
 		pnetwork->IELength = wps_offset + (wps_ielen + 2) + remainder_ielen;
 	}
 
+exit:
 	kfree(pbackup_remainder_ie);
 }