Upstream: updated list of ngx_event_connect_peer() return values.

ngx_http_upstream_get_keepalive_peer() may return NGX_DONE to
indicate that the cached keepalive connection is reused.

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 16e6602..5ba7942 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1181,7 +1181,7 @@
         return;
     }
 
-    /* rc == NGX_OK || rc == NGX_AGAIN */
+    /* rc == NGX_OK || rc == NGX_AGAIN || rc == NGX_DONE */
 
     c = u->peer.connection;