NoteDbUpdateManager: Clear temp inserter right after flushing

Change-Id: I1f9296981887d5e7757fcc909db1d48e35256c41

gerrit-server/src/main/java/com/google/gerrit/server/notedb/NoteDbUpdateManager.java

@@ -170,7 +170,6 @@ public class NoteDbUpdateManager implements AutoCloseable {
     void flush() throws IOException {
       flushToFinalInserter();
       finalIns.flush();
-      tempIns.clear();
     }
 
     void flushToFinalInserter() throws IOException {
@@ -178,6 +177,7 @@ public class NoteDbUpdateManager implements AutoCloseable {
       for (InsertedObject obj : tempIns.getInsertedObjects()) {
         finalIns.insert(obj.type(), obj.data().toByteArray());
       }
+      tempIns.clear();
     }
 
     @Override