net: fix misspelled variable name (fixes windows build)
net: fix misspelled variable name (fixes windows build)

R=golang-dev, adg
CC=golang-dev, mikioh.mikioh
https://codereview.appspot.com/12848047

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