Fix error returned when closing VoiceClient

* fix handling of error in nhooyr websocket wrapper (mentioned in andersfylling#298)
	* closing context given to g.c.Read(ctx) leads to WebSocket being closed
  	  coder/websocket#242

internal/gateway/client.go

@@ -510,7 +510,9 @@ func (c *client) receiver(ctx context.Context) {
 		var packet []byte
 		var err error
 		if packet, err = c.conn.Read(ctx); err != nil {
-			c.log.Debug(c.getLogPrefix(), "read error: ", err.Error())
+			if !errors.Is(err, context.Canceled) && ctx.Err() != nil {
+				c.log.Debug(c.getLogPrefix(), "read error: ", err.Error())
+			}
 			reconnect := true
 			var closeErr *CloseErr
 			isCloseErr := errors.As(err, &closeErr)

internal/gateway/websocket_nhooyr.go

@@ -69,6 +69,12 @@ func (g *nhooyr) Read(ctx context.Context) (packet []byte, err error) {
 	var messageType websocket.MessageType
 	messageType, packet, err = g.c.Read(ctx)
 	if err != nil {
+		// Cancelling Read by ctx results in closed WS, see issue
+		// https://github.com/nhooyr/websocket/issues/242
+		if ctx.Err() != nil && errors.Is(err, context.Canceled) {
+			g.isConnected.Store(false)
+			return nil, context.Canceled
+		}
 		var closeErr websocket.CloseError
 		if errors.As(err, &closeErr) {
 			g.isConnected.Store(false)