Adjusted to TQPtrStack class. This is a minor change.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 12602af928)

tdecore/knotifyclient.cpp

@@ -363,7 +363,7 @@ bool KNotifyClient::Instance::useSystemBell() const
 // is available, we have a default-instance with kapp as TDEInstance.
 // We make sure to always have that default-instance in the stack, because
 // the stack might have gotten cleared in the destructor.
-// We can't use QStack::setAutoDelete( true ), because no instance besides
+// We can't use QPtrStack::setAutoDelete( true ), because no instance besides
 // our default instance is owned by us.
 KNotifyClient::Instance * KNotifyClient::Instance::currentInstance()
 {