check port in upstream list

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 89240c0..aedc504 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -392,6 +392,7 @@
             uscf = uscfp[i];
 
             if (uscf->host.len == host->len
+                && uscf->port == u->resolved->port
                 && ngx_memcmp(uscf->host.data, host->data, host->len) == 0)
             {
                 goto found;