remove noop second rollback and second close, to make closure process more atomic

h2/src/main/org/h2/server/TcpServerThread.java

@@ -183,23 +183,12 @@ public class TcpServerThread implements Runnable {
     private void closeSession() {
         if (session != null) {
             RuntimeException closeError = null;
-            try {
-                Command rollback = session.prepareLocal("ROLLBACK");
-                rollback.executeUpdate(false);
-            } catch (RuntimeException e) {
-                closeError = e;
-                server.traceError(e);
-            } catch (Exception e) {
-                server.traceError(e);
-            }
             try {
                 session.close();
                 server.removeConnection(threadId);
             } catch (RuntimeException e) {
-                if (closeError == null) {
-                    closeError = e;
-                    server.traceError(e);
-                }
+                closeError = e;
+                server.traceError(e);
             } catch (Exception e) {
                 server.traceError(e);
             } finally {
@@ -544,7 +533,6 @@ public class TcpServerThread implements Runnable {
         }
         default:
             trace("Unknown operation: " + operation);
-            closeSession();
             close();
         }
     }