exp/winfsnotify: fix govet-found bug
exp/winfsnotify: fix govet-found bug

R=golang-dev, hectorchu
CC=golang-dev
http://codereview.appspot.com/5304044

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang