net: fix small bug introduced by 48f7c4dd87fe
net: fix small bug introduced by 48f7c4dd87fe

Fixes issue 6063

R=golang-dev, r, dave
CC=dvyukov, golang-dev
https://codereview.appspot.com/12586043

apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,tv42/old-go,tv42/old-go,tv42/old-go,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme