fix r3707: cache node should be freed be a response is not cached
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index de2b970..93a0e53 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1722,7 +1722,7 @@
 
 #if (NGX_HTTP_CACHE)
 
-            if (u->cacheable && r->cache) {
+            if (r->cache) {
                 time_t  valid;
 
                 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,