Revert "fix f79ad91"

This reverts commit e8e3db6888.

Destination.cpp

@@ -185,7 +185,6 @@ namespace client
 						if(ls && !ls->IsExpired())
 						{
 							ls->PopulateLeases();
-							std::unique_lock<std::mutex> lock(m_RemoteLeaseSetsMutex);
 							m_RemoteLeaseSets[ident] = ls;
 						}
 					});