Fix assert

Change-Id: I41b4b444fdce6d73c0c62aa1d98a7c9d80a6a4c9
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/cpptools/insertionpointlocator.cpp

@@ -351,7 +351,7 @@ public:
 
     const Value &get() const
     {
-        QTC_ASSERT(_set, return Value());
+        QTC_CHECK(_set);
         return _value;
     }
 };