[Releasing] Fix for crash on exit in the alpha

[Thiago Macieira]

https://codereview.qt-project.org/20342 is now staged. It fixes a crash on exit 
found with some applications run with the alpha, notably Qt Creator.

If the alpha package is regenerated, I'd highly recommend including this 
change when it's integrated.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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