bugfix: incorrectly used ngx_conf_log_error by using NGX_ERROR as the first argument, as reported by runner-mei in github issue #92.

Author: agentzh

src/ngx_http_lua_conf.c

@@ -48,7 +48,8 @@ ngx_http_lua_init_main_conf(ngx_conf_t *cf, void *conf)
 
     if (lmcf->lua == NULL) {
         if (ngx_http_lua_init_vm(cf, lmcf) != NGX_CONF_OK) {
-            ngx_conf_log_error(NGX_ERROR, cf, 0, "Failed to initialize Lua VM");
+            ngx_conf_log_error(NGX_LOG_ERR, cf, 0,
+                               "Failed to initialize Lua VM");
             return NGX_CONF_ERROR;
         }