Make mThread a local

Small cleanup

Test: CarrierPrivilegeAuthenticatorTest
Change-Id: I6b3270d60d67c227bcb9f9a75a47abddd08bf474
diff --git a/service/src/com/android/server/connectivity/CarrierPrivilegeAuthenticator.java b/service/src/com/android/server/connectivity/CarrierPrivilegeAuthenticator.java
index 27c9126..a3b5cdc 100644
--- a/service/src/com/android/server/connectivity/CarrierPrivilegeAuthenticator.java
+++ b/service/src/com/android/server/connectivity/CarrierPrivilegeAuthenticator.java
@@ -70,7 +70,6 @@
     @GuardedBy("mLock")
     private int mModemCount = 0;
     private final Object mLock = new Object();
-    private final HandlerThread mThread;
     private final Handler mHandler;
     @NonNull
     private final List<CarrierPrivilegesListenerShim> mCarrierPrivilegesChangedListeners =
@@ -84,9 +83,9 @@
         mContext = c;
         mTelephonyManager = t;
         mTelephonyManagerShim = telephonyManagerShim;
-        mThread = new HandlerThread(TAG);
-        mThread.start();
-        mHandler = new Handler(mThread.getLooper());
+        final HandlerThread thread = new HandlerThread(TAG);
+        thread.start();
+        mHandler = new Handler(thread.getLooper());
         mUseCallbacksForServiceChanged = deps.isFeatureEnabled(
                 c, CARRIER_SERVICE_CHANGED_USE_CALLBACK);
         synchronized (mLock) {