ndb - bug#30764

  When adding a read to lock queue, where there is a X-lock ahead, upgrade to X-lock
  (found by pekkas blob changes)

storage/ndb/src/kernel/blocks/dbacc/DbaccMain.cpp

@@ -2137,6 +2137,7 @@ Dbacc::placeReadInLockQueue(OperationrecPtr lockOwnerPtr)
   if (same && (lastbits & Operationrec::OP_ACC_LOCK_MODE))
   {
     jam();
+    opbits |= Operationrec::OP_LOCK_MODE; // Upgrade to X-lock
     goto checkop;
   }