fixup

Author: halter73

src/Servers/Kestrel/Core/src/Middleware/Http3ConnectionMiddleware.cs

@@ -31,7 +31,7 @@ public Task OnConnectionAsync(MultiplexedConnectionContext connectionContext)
                 ConnectionContext = connectionContext,
                 ServiceContext = _serviceContext,
                 ConnectionFeatures = connectionContext.Features,
-                MemoryPool = memoryPoolFeature.MemoryPool,
+                MemoryPool = memoryPoolFeature?.MemoryPool ?? System.Buffers.MemoryPool<byte>.Shared,
                 LocalEndPoint = connectionContext.LocalEndPoint as IPEndPoint,
                 RemoteEndPoint = connectionContext.RemoteEndPoint as IPEndPoint
             };

src/Servers/Kestrel/Core/src/Middleware/HttpConnectionMiddleware.cs

@@ -1,7 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System.Buffers;
 using System.Net;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Connections;
@@ -44,6 +43,5 @@ public Task OnConnectionAsync(ConnectionContext connectionContext)
 
             return connection.ProcessRequestsAsync(_application);
         }
-
     }
 }