fix r3708 and r3695: valid_sec is set only for caching error status codes
diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index ad97f07..3bb7054 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -932,7 +932,7 @@
fcn->valid_msec = c->valid_msec;
fcn->error = c->error;
- } else if (fcn->valid_sec == 0 && fcn->count == 0) {
+ } else if (!fcn->exists && fcn->count == 0) {
ngx_queue_remove(&fcn->queue);
ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
ngx_slab_free_locked(cache->shpool, fcn);