don't lock the META table in verifyMetaLocked(), since we're just going to throw…

don't lock the META table in verifyMetaLocked(), since we're just going to throw an exception if it wasn't locked already

h2/src/main/org/h2/engine/Database.java

@@ -861,7 +861,8 @@ public class Database implements DataHandler {
      * @param session the session
      */
     public void verifyMetaLocked(Session session) {
-        if (!lockMeta(session) && lockMode != Constants.LOCK_MODE_OFF) {
+        if (meta != null && !meta.isLockedExclusivelyBy(session)
+                && lockMode != Constants.LOCK_MODE_OFF) {
             throw DbException.throwInternalError();
         }
     }