net.websocket: swap unsafe use of nil for a safe default value (#15836)

vlib/net/websocket/websocket_client.v

@@ -36,11 +36,14 @@ pub mut:
 	header            http.Header  // headers that will be passed when connecting
 	conn              &net.TcpConn = unsafe { nil } // underlying TCP socket connection
 	nonce_size        int = 16 // size of nounce used for masking
-	panic_on_callback bool        // set to true of callbacks can panic
-	state             State       // current state of connection
-	logger            &log.Logger = unsafe { nil } // logger used to log messages
-	resource_name     string      // name of current resource
-	last_pong_ut      i64 // last time in unix time we got a pong message
+	panic_on_callback bool  // set to true of callbacks can panic
+	state             State // current state of connection
+	// logger used to log messages
+	logger &log.Logger = &log.Logger(&log.Log{
+	level: .info
+})
+	resource_name string // name of current resource
+	last_pong_ut  i64    // last time in unix time we got a pong message
 }
 
 // Flag represents different types of headers in websocket handshake

vlib/net/websocket/websocket_server.v

@@ -9,7 +9,9 @@ import rand
 // Server represents a websocket server connection
 pub struct Server {
 mut:
-	logger                  &log.Logger      = unsafe { nil } // logger used to log
+	logger &log.Logger = &log.Logger(&log.Log{
+	level: .info
+})
 	ls                      &net.TcpListener = unsafe { nil } // listener used to get incoming connection to socket
 	accept_client_callbacks []AcceptClientFn      // accept client callback functions
 	message_callbacks       []MessageEventHandler // new message callback functions