remove unnecessary ?

Author: twsouthwick

src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SSPI/NegotiateSspiContextProvider.cs

@@ -49,7 +49,7 @@ private NegotiateAuthentication GetNegotiateAuthenticationForParams(SspiAuthenti
                 }
 
                 // Dispose of it since we're not going to use it now
-                _negotiateAuth?.Dispose();
+                _negotiateAuth.Dispose();
             }
 
             return _negotiateAuth = new(new NegotiateAuthenticationClientOptions { Package = "Negotiate", TargetName = authParams.Resource });