Fix compilation

Unused variable

Change-Id: I190d8adf6efba8273ded2288c7232a1e77ef62f9
Reviewed-by: hjk <hjk121@nokiamail.com>

tests/manual/debugger/simple/simple_test_app.cpp

@@ -3311,6 +3311,7 @@ namespace lambda {
         std::string x;
         auto f = [&] () -> const std::string & {
                 int z = x.size();
+                Q_UNUSED(z);
                 return x;
          };
         auto c = f();