crypto/tls: fix compile error
crypto/tls: fix compile error

Fixes Issue 1555.

R=rsc, bradfitzgo
CC=golang-dev
http://codereview.appspot.com/4284047

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

pombredanne/go-deleteme,gnanderson/go,ssrl/go,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,gnanderson/go,apparentlymart/golang,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,tv42/old-go,gnanderson/go,ssrl/go,apparentlymart/golang,ssrl/go,ssrl/go,dsriram/golang,tv42/old-go,ssrl/go,ssrl/go,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,dsriram/golang,gnanderson/go,dsriram/golang,gnanderson/go,tv42/old-go,pombredanne/go-deleteme