fix error message

src/http/modules/ngx_http_log_module.c

diff --git a/src/http/modules/ngx_http_log_module.c b/src/http/modules/ngx_http_log_module.c
index b2a23dd..f4eefde 100644
--- a/src/http/modules/ngx_http_log_module.c
+++ b/src/http/modules/ngx_http_log_module.c
@@ -422,7 +422,8 @@
     {
         ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                       ngx_open_file_n " \"%s\" failed", log.data);
-        return -1;
+        /* simulate successfull logging */
+        return len;
     }
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,