GP-5090 Corrected FileDataTypeManager.close() issue

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/FileDataTypeManager.java

@@ -4,9 +4,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -288,12 +288,12 @@ public class FileDataTypeManager extends StandAloneDataTypeManager
 	}
 
 	@Override
-	public void close() {
+	public synchronized void close() {
 		if (packedDB != null) {
+			super.close();
 			packedDB.dispose();
 			packedDB = null;
 		}
-		super.close();
 	}
 
 	public boolean isClosed() {