Cache: fixed updating bypassed cached errors (ticket #827).
diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index 37cd377..38b695e 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -1403,6 +1403,7 @@
     ngx_shmtx_lock(&cache->shpool->mutex);
 
     c->node->count--;
+    c->node->error = 0;
     c->node->uniq = uniq;
     c->node->body_start = c->body_start;