Qutex: currOwner should use registered sh_ptr to Lockvoker

This ensures that the Lockvoker object we access from currOwner
remains valid past the lifetime of the Lockvoker object that
gets copied and invoked by boost::asio

include/asynchronousContinuationChainLink.h

@@ -20,7 +20,7 @@ public:
     virtual ~AsynchronousContinuationChainLink() = default;
 
 	virtual std::shared_ptr<AsynchronousContinuationChainLink>
-	getCallersContinuation() = 0;
+	getCallersContinuationShPtr() = 0;
 };
 
 } // namespace smo