Don't suppress exceptions

It is better to log them.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

shadowsocks-csharp/Controller/Service/TCPRelay.cs

@@ -218,8 +218,8 @@ namespace Shadowsocks.Controller
             }
             try
             {
-                _connection?.Shutdown(SocketShutdown.Both);
-                _connection?.Close();
+                _connection.Shutdown(SocketShutdown.Both);
+                _connection.Close();
             }
             catch (Exception e)
             {
@@ -227,9 +227,9 @@ namespace Shadowsocks.Controller
             }
             try
             {
-                var remote = _currentRemoteSession?.Remote;
-                remote?.Shutdown(SocketShutdown.Both);
-                remote?.Close();
+                var remote = _currentRemoteSession.Remote;
+                remote.Shutdown(SocketShutdown.Both);
+                remote.Close();
             }
             catch (Exception e)
             {

shadowsocks-csharp/Proxy/DirectConnect.cs

@@ -67,7 +67,7 @@ namespace Shadowsocks.Proxy
         public void BeginSend(byte[] buffer, int offset, int size, SocketFlags socketFlags, AsyncCallback callback,
             object state)
         {
-            _remote?.BeginSend(buffer, offset, size, socketFlags, callback, state);
+            _remote.BeginSend(buffer, offset, size, socketFlags, callback, state);
         }
 
         public int EndSend(IAsyncResult asyncResult)
@@ -78,7 +78,7 @@ namespace Shadowsocks.Proxy
         public void BeginReceive(byte[] buffer, int offset, int size, SocketFlags socketFlags, AsyncCallback callback,
             object state)
         {
-            _remote?.BeginReceive(buffer, offset, size, socketFlags, callback, state);
+            _remote.BeginReceive(buffer, offset, size, socketFlags, callback, state);
         }
 
         public int EndReceive(IAsyncResult asyncResult)
@@ -88,12 +88,12 @@ namespace Shadowsocks.Proxy
 
         public void Shutdown(SocketShutdown how)
         {
-            _remote?.Shutdown(how);
+            _remote.Shutdown(how);
         }
 
         public void Close()
         {
-            _remote?.Dispose();
+            _remote.Dispose();
         }
     }
 }