Minor fixes for websocket code

Emby.Server.Implementations/HttpServer/HttpListenerHost.cs

@@ -567,7 +567,7 @@ namespace Emby.Server.Implementations.HttpServer
 
                 WebSocket webSocket = await context.WebSockets.AcceptWebSocketAsync().ConfigureAwait(false);
 
-                var connection = new WebSocketConnection(
+                using var connection = new WebSocketConnection(
                     _loggerFactory.CreateLogger<WebSocketConnection>(),
                     webSocket,
                     context.Connection.RemoteIpAddress,

Emby.Server.Implementations/HttpServer/WebSocketConnection.cs

@@ -19,7 +19,7 @@ namespace Emby.Server.Implementations.HttpServer
     /// <summary>
     /// Class WebSocketConnection.
     /// </summary>
-    public class WebSocketConnection : IWebSocketConnection
+    public class WebSocketConnection : IWebSocketConnection, IDisposable
     {
         /// <summary>
         /// The logger.
@@ -119,7 +119,7 @@ namespace Emby.Server.Implementations.HttpServer
                 Memory<byte> memory = writer.GetMemory(512);
                 try
                 {
-                    receiveresult = await _socket.ReceiveAsync(memory, cancellationToken);
+                    receiveresult = await _socket.ReceiveAsync(memory, cancellationToken).ConfigureAwait(false);
                 }
                 catch (WebSocketException ex)
                 {
@@ -137,7 +137,7 @@ namespace Emby.Server.Implementations.HttpServer
                 writer.Advance(bytesRead);
 
                 // Make the data available to the PipeReader
-                FlushResult flushResult = await writer.FlushAsync();
+                FlushResult flushResult = await writer.FlushAsync().ConfigureAwait(false);
                 if (flushResult.IsCompleted)
                 {
                     // The PipeReader stopped reading
@@ -223,7 +223,7 @@ namespace Emby.Server.Implementations.HttpServer
 
             if (info.MessageType.Equals("KeepAlive", StringComparison.Ordinal))
             {
-                await SendKeepAliveResponse();
+                await SendKeepAliveResponse().ConfigureAwait(false);
             }
             else
             {