Fixes golint warning about "if block ends with a return statement, so drop this else and outdent its block".

Change-Id: I6fc8724f586efcb6e2ed92ee36be421d3e9a8c80
Reviewed-on: https://go-review.googlesource.com/c/144137Reviewed-by: Ralph Corderoy <ralph@inputplus.co.uk>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>