Fix some VS compiler warnings.
Fix some VS compiler warnings.

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