net: fix ResolveIPAddr
net: fix ResolveIPAddr

Fixes misedit in CL 6842053.

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/6849115
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go