disk_partitions(): little speedup
disk_partitions(): little speedup

jamesblunt/psutil,jorik041/psutil,mrjefftang/psutil,jamesblunt/psutil,giampaolo/psutil,msarahan/psutil,giampaolo/psutil,mrjefftang/psutil,cloudbase/psutil,0-wiz-0/psutil,qbit/psutil,mrjefftang/psutil,qbit/psutil,jamesblunt/psutil,jorik041/psutil,jorik041/psutil,msarahan/psutil,msarahan/psutil,cloudbase/psutil,cloudbase/psutil,qbit/psutil,0-wiz-0/psutil