return NULL instead of NGX_CONF_ERROR on a create conf failure
diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index 84a7672..7f53d54 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -1154,7 +1154,7 @@
 
     conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_dav_loc_conf_t));
     if (conf == NULL) {
-        return NGX_CONF_ERROR;
+        return NULL;
     }
 
     /*