strict testing "access_log off"

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 170e3a2..a5ace7d 100644
--- a/src/http/modules/ngx_http_log_module.c
+++ b/src/http/modules/ngx_http_log_module.c
@@ -837,7 +837,13 @@
 
     if (ngx_strcmp(value[1].data, "off") == 0) {
         llcf->off = 1;
-        return NGX_CONF_OK;
+        if (cf->args->nelts == 2) {
+            return NGX_CONF_OK;
+        }
+
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid parameter \"%V\"", &value[2]);
+        return NGX_CONF_ERROR;
     }
 
     if (llcf->logs == NULL) {