Upstream: jump out of loop after matching the status code.

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 89e1319..be96be4 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2502,6 +2502,8 @@
         }
 
 #endif
+
+        break;
     }
 
 #if (NGX_HTTP_CACHE)