Tightened code to avoid possible unexpected runtime errors during token callback

Author: sharadraju

Diff for: doc/src/release_notes.rst

@@ -50,6 +50,9 @@ Thin Mode Changes
 Thick Mode Changes
 +++++++++++++++++++
 
+#)  Tightened code to avoid possible unexpected runtime errors during token
+    callback.
+
 #)  Fixed an issue that caused unexpected behavior with SODA functions in
     some platforms.
 

Diff for: src/njsTokenCallback.c

@@ -154,7 +154,8 @@ static void njsTokenCallback_processNotification(uv_async_t *handle)
 static bool njsTokenCallback_processNotificationHelper(
         njsTokenCallback *callback)
 {
-    napi_value jsAccessTokenConfig, jsCallback, jsCallbackHandler, jsPool, refresh, result;
+    napi_value jsAccessTokenConfig = napi_undefined, jsCallback,
+            jsCallbackHandler, jsPool, refresh, result;
     napi_value jsCallbackArgs[4], externalObj;
     napi_env env = callback->env;