unicode/norm: remove unreachable code

Makes vet happy.

Change-Id: Idbebf963fafeae99c1304094927e74af4b30176a
Reviewed-on: https://go-review.googlesource.com/31757
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed