optimization

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 0956f01..88cae8f 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -980,8 +980,7 @@
 #endif
     }
 
-    n = u->peer.connection->recv(u->peer.connection, u->buffer.last,
-                                 u->buffer.end - u->buffer.last);
+    n = c->recv(c, u->buffer.last, u->buffer.end - u->buffer.last);
 
     if (n == NGX_AGAIN) {
 #if 0