Revert "staging: r8188eu: remove rtw_buf_free() function"

This reverts commit c7e88ecbe328e2bcd892d84c4b26eff86cb776ef as it's
broken because somehow I forgot how pointers work...

Reported-by: Larry Finger <[e-mail]>
Cc: "Fabio M. De Francesco" <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/r8188eu/core/rtw_mlme.c

···
 
 void rtw_free_mlme_priv_ie_data(struct mlme_priv *pmlmepriv)
 {
-	kfree(&pmlmepriv->assoc_req);
-	pmlmepriv->assoc_req = NULL;
-	pmlmepriv->assoc_req_len = 0;
-	kfree(&pmlmepriv->assoc_rsp);
-	pmlmepriv->assoc_rsp = NULL;
-	pmlmepriv->assoc_rsp_len = 0;
+	rtw_buf_free(&pmlmepriv->assoc_req, &pmlmepriv->assoc_req_len);
+	rtw_buf_free(&pmlmepriv->assoc_rsp, &pmlmepriv->assoc_rsp_len);
 	rtw_free_mlme_ie_data(&pmlmepriv->wps_beacon_ie, &pmlmepriv->wps_beacon_ie_len);
 	rtw_free_mlme_ie_data(&pmlmepriv->wps_probe_req_ie, &pmlmepriv->wps_probe_req_ie_len);
 	rtw_free_mlme_ie_data(&pmlmepriv->wps_probe_resp_ie, &pmlmepriv->wps_probe_resp_ie_len);

drivers/staging/r8188eu/core/rtw_mlme_ext.c

···
 	if (res > 0) {
 		rtw_buf_update(&pmlmepriv->assoc_rsp, &pmlmepriv->assoc_rsp_len, pframe, pkt_len);
 	} else {
-		kfree(&pmlmepriv->assoc_rsp);
-		pmlmepriv->assoc_rsp = NULL;
-		pmlmepriv->assoc_rsp_len = 0;
+		rtw_buf_free(&pmlmepriv->assoc_rsp, &pmlmepriv->assoc_rsp_len);
 	}
 
 	report_join_res(padapter, res);
···
 exit:
 	if (ret == _SUCCESS)
 		rtw_buf_update(&pmlmepriv->assoc_req, &pmlmepriv->assoc_req_len, (u8 *)pwlanhdr, pattrib->pktlen);
-	else {
-		kfree(&pmlmepriv->assoc_req);
-		pmlmepriv->assoc_req = NULL;
-		pmlmepriv->assoc_req_len = 0;
-	}
+	else
+		rtw_buf_free(&pmlmepriv->assoc_req, &pmlmepriv->assoc_req_len);
 
 	return;
 }

drivers/staging/r8188eu/include/osdep_service.h

···
 			 (((u64) (a)[3]) << 24) | (((u64) (a)[2]) << 16) | \
 			 (((u64) (a)[1]) << 8) | ((u64) (a)[0]))
 
+void rtw_buf_free(u8 **buf, u32 *buf_len);
 void rtw_buf_update(u8 **buf, u32 *buf_len, u8 *src, u32 src_len);
 
 struct rtw_cbuf {

drivers/staging/r8188eu/os_dep/osdep_service.c

···
 	return x;
 }
 
+void rtw_buf_free(u8 **buf, u32 *buf_len)
+{
+	*buf_len = 0;
+	kfree(*buf);
+	*buf = NULL;
+}
+
 void rtw_buf_update(u8 **buf, u32 *buf_len, u8 *src, u32 src_len)
 {
 	u32 ori_len = 0, dup_len = 0;