fix the previous commit

src/core/ngx_open_file_cache.c

diff --git a/src/core/ngx_open_file_cache.c b/src/core/ngx_open_file_cache.c
index 3297340..36e297e 100644
--- a/src/core/ngx_open_file_cache.c
+++ b/src/core/ngx_open_file_cache.c
@@ -76,7 +76,7 @@
     for ( ;; ) {
 
         if (ngx_queue_empty(&cache->expire_queue)) {
-            return;
+            break;
         }
 
         q = ngx_queue_last(&cache->expire_queue);