[bug] lua_socket_log_errors not working for ngx.socket.tcp():connect()

Version: openresty/1.21.4.

To reproduce:

# other stuff
http {
    include       mime.types;
    # ... other stuff
    lua_socket_log_errors off;

    server {
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
            access_by_lua_block {
                local c = ngx.socket.tcp()
                c:connect("unix:/inexist.sock")
            }
        }
    }
}

curl localhost

We see

2022/12/27 18:14:28 [crit] 25707#0: *1 connect() to unix:/inexist.sock failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", host: "localhost"

We expect lua_socket_log_errors to mute connect error.

Start by reproducing the provided NGINX configuration with lua_socket_log_errors off and the unix:/inexist.sock connection. Trace the ngx.socket.tcp():connect() path and the handling of lua_socket_log_errors; done means the reproduced failed connection no longer emits the shown critical log entry.