fix compilation warning about possible misuse of XDECREF
fix compilation warning about possible misuse of XDECREF

Q-Leap-Networks/psutil,packages/psutil,mrjefftang/psutil,cloudbase/psutil,0-wiz-0/psutil,packages/psutil,cloudbase/psutil,qbit/psutil,Q-Leap-Networks/psutil,giampaolo/psutil,0-wiz-0/psutil,msarahan/psutil,giampaolo/psutil,qbit/psutil,msarahan/psutil,mrjefftang/psutil,cloudbase/psutil,mrjefftang/psutil,qbit/psutil,jorik041/psutil,jamesblunt/psutil,packages/psutil,msarahan/psutil,jorik041/psutil,jorik041/psutil,jamesblunt/psutil,jamesblunt/psutil