use pool instead of ngx_conf_t
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 88cae8f..88b0084 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -3065,7 +3065,7 @@
     u.url = value[1];
     u.default_port = 80;
 
-    if (ngx_parse_url(cf, &u) != NGX_OK) {
+    if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
         if (u.err) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                "%s in upstream \"%V\"", u.err, &u.url);
@@ -3180,7 +3180,7 @@
 
     if (!(flags & NGX_HTTP_UPSTREAM_CREATE)) {
 
-        if (ngx_parse_url(cf, u) != NGX_OK) {
+        if (ngx_parse_url(cf->pool, u) != NGX_OK) {
             if (u->err) {
                 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                    "%s in upstream \"%V\"", u->err, &u->url);