fix(win32): cleanup client state in addon destructor

Author: mbroadst

src/kerberos.h

@@ -3,6 +3,7 @@
 
 #include <nan.h>
 #include "kerberos_common.h"
+
 class KerberosServer : public Nan::ObjectWrap {
    public:
     static NAN_MODULE_INIT(Init);

src/win32/kerberos_win32.cc

@@ -30,10 +30,10 @@ NAN_INLINE std::wstring WStringOptionValue(v8::Local<v8::Object> options, const
 
 /// KerberosClient
 KerberosClient::~KerberosClient() {
-    // if (_state != NULL) {
-    //     authenticate_gss_client_clean(_state);
-    //     _state = NULL;
-    // }
+    if (_state != NULL) {
+        auth_sspi_client_clean(_state);
+        _state = NULL;
+    }
 }
 
 NAN_METHOD(KerberosClient::Step) {