Remove superfluous call from qWaitFor

The remaining time will be fetched again after checking the predicate, so the
read value was never used.

Change-Id: I627152116ea579577e490ecefbaee02fec4aabdc
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/testlib/qtestsystem.h

@@ -74,10 +74,8 @@ namespace QTest
             QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
 
             remaining = deadline.remainingTime();
-            if (remaining > 0) {
+            if (remaining > 0)
                 QTest::qSleep(qMin(10, remaining));
-                remaining = deadline.remainingTime();
-            }
 
             if (predicate())
                 return true;