Definitely abort reconnecting to native daemon during shutdown

Symptom:
System_server crashed due to unsolved "netd" service.

Root cause:
My previous patch was not enough for avoiding this crash.
a00d4b0 Abort connecting to native daemon during shutdown

listenToSocket loop can be finished without throwing exception.

Solution:
It's better to test shutdown condition before reconnection even
though listenToSocket is finished without exception.

Bug: 68742327
Change-Id: Ifdfe43d52bef891f55bd7b07cc1aa0fa248a6030

services/core/java/com/android/server/NativeDaemonConnector.java

@@ -134,21 +134,23 @@ final class NativeDaemonConnector implements Runnable, Handler.Callback, Watchdo
         mCallbackHandler = new Handler(mLooper, this);
 
         while (true) {
+            if (isShuttingDown()) break;
             try {
                 listenToSocket();
             } catch (Exception e) {
                 loge("Error in NativeDaemonConnector: " + e);
-                String shutdownAct = SystemProperties.get(
+                if (isShuttingDown()) break;
-                        ShutdownThread.SHUTDOWN_ACTION_PROPERTY, "");
-                if (shutdownAct != null && shutdownAct.length() > 0) {
-                    // The device is in middle of shutdown.
-                    break;
-                }
                 SystemClock.sleep(5000);
             }
         }
     }
 
+    private static boolean isShuttingDown() {
+        String shutdownAct = SystemProperties.get(
+            ShutdownThread.SHUTDOWN_ACTION_PROPERTY, "");
+        return shutdownAct != null && shutdownAct.length() > 0;
+    }
+
     @Override
     public boolean handleMessage(Message msg) {
         final String event = (String) msg.obj;