net: fix /proc/net/igmp,igmp6 reading bug on linux
net: fix /proc/net/igmp,igmp6 reading bug on linux

Fixes issue 2130.

R=rsc, dave
CC=golang-dev
http://codereview.appspot.com/4846044

Committer: David Symonds <7f6bb564ed9e580d4f0aa90d53b34578e5d24cb9@golang.org>

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go