Fix 'no else after return' in gitinfo.
Fix 'no else after return' in gitinfo.

Reported by golint tool.

Found with the following procedure:

$ cd ~/golib
$ go get github.com/golang/lint/golint
$ cd ~/buildbot/perf/
$ ~/golib/bin/golint go/gitinfo
go/gitinfo/gitinfo.go:83:9: if block ends with a return statement, so
drop this else and outdent its block

BUG=None
TEST=make testgo
R=mtklein@google.com

Review URL: https://codereview.chromium.org/626763002

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot