fix subrequest limit

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 2b4f56f..ff93348 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1298,6 +1298,7 @@
     if (r->main->subrequests == 0) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "subrequests cycle while processing \"%V\"", uri);
+        r->main->subrequests = 1;
         return NGX_ERROR;
     }