Remove unused class.

src/Renci.SshNet/Renci.SshNet.csproj

@@ -430,7 +430,6 @@
       <SubType>Code</SubType>
     </Compile>
     <Compile Include="Sftp\SftpOpenAsyncResult.cs" />
-    <Compile Include="Sftp\SftpOpenDirAsyncResult.cs" />
     <Compile Include="Sftp\SftpReadAsyncResult.cs" />
     <Compile Include="Sftp\SftpRealPathAsyncResult.cs" />
     <Compile Include="Sftp\SftpSession.cs">

src/Renci.SshNet/Sftp/SftpOpenDirAsyncResult.cs

@@ -1,12 +0,0 @@
-using Renci.SshNet.Common;
-using System;
-
-namespace Renci.SshNet.Sftp
-{
-    internal class SftpOpenDirAsyncResult : AsyncResult<byte[]>
-    {
-        public SftpOpenDirAsyncResult(AsyncCallback asyncCallback, object state) : base(asyncCallback, state)
-        {
-        }
-    }
-}