[libtaskmanager] Prevent from dereferencing dangling pointer

Review Request #128021 - Created May 26, 2016 and submitted - Latest diff uploaded

Information
Anthony Fieroni
plasma-desktop
Plasma/5.6
Reviewers
plasma
hein

This pointers are shared between plasma-framework and libtaskamanger

I experience rare and strage crashes in plasmashell without backtrace when tooltip is dismissed in taskmanager. I guess stack is smashed cause dereferencing invalid pointer.

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