net: fix network timeout boundary condition. Fixes issue 472.
net: fix network timeout boundary condition.
Fixes issue 472.

R=golang-dev
CC=golang-dev
http://codereview.appspot.com/223108

pombredanne/go-deleteme,h8liu/golang,apparentlymart/golang,tianon/debian-golang,h8liu/golang,dsriram/golang,gnanderson/go,tv42/old-go,tv42/old-go,nightlyone/golang,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,apparentlymart/golang,tv42/old-go,apparentlymart/golang,h8liu/golang,tianon/debian-golang,gnanderson/go,tv42/old-go,tianon/debian-golang,bdwalton/debian-golang,h8liu/golang,tv42/old-go,pombredanne/go-deleteme,nightlyone/golang,dsriram/golang,gnanderson/go,gnanderson/go,tianon/debian-golang,h8liu/golang,nightlyone/golang,ssrl/go,ssrl/go,bdwalton/debian-golang,apparentlymart/golang,gnanderson/go,dsriram/golang,nightlyone/golang,pombredanne/go-deleteme,bdwalton/debian-golang,dsriram/golang,h8liu/golang,bdwalton/debian-golang,h8liu/golang,tianon/debian-golang,bdwalton/debian-golang,ssrl/go,tianon/debian-golang,pombredanne/go-deleteme,tianon/debian-golang,gnanderson/go,nightlyone/golang,apparentlymart/golang,apparentlymart/golang,ssrl/go,dsriram/golang,ssrl/go,ssrl/go,pombredanne/go-deleteme,bdwalton/debian-golang,ssrl/go,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,nightlyone/golang,bdwalton/debian-golang,bdwalton/debian-golang,nightlyone/golang,tianon/debian-golang,dsriram/golang,apparentlymart/golang