Lockset: check for registration b4 unregistering

smocore/lockSet.cpp

@@ -101,6 +101,14 @@ bool LockSet<OriginalCbFnT>::tryAcquireOrBackOff(
 template <class OriginalCbFnT>
 void LockSet<OriginalCbFnT>::unregisterFromQutexQueues()
 {
+	if (!registeredInQutexQueues)
+	{
+		throw std::runtime_error(
+			std::string(__func__) +
+			": LockSet::unregisterFromQutexQueues() called but not "
+			"registered in Qutex queues");
+	}
+
 	// Unregister from all qutex queues
 	for (auto& lockUsageDesc : locks)
 	{