fix: Fixing the shutdown logic for streaming subscriber connection (#…

…1613)

* fix: Fixing the shutdown logic for streaming subscriber connection

* fix: Fixing the shutdown logic for streaming subscriber connection

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google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/StreamingSubscriberConnection.java

@@ -191,15 +191,14 @@ protected void doStart() {
 
   @Override
   protected void doStop() {
-    runShutdown();
-
     lock.lock();
     try {
       clientStream.closeSendWithError(Status.CANCELLED.asException());
     } finally {
       lock.unlock();
-      notifyStopped();
     }
+    runShutdown();
+    notifyStopped();
   }
 
   private void runShutdown() {