all: fix some lint issues
Make some code more simple.
Change-Id: I801adf0dba5f6c515681345c732dbb907f945419
GitHub-Last-Rev:
a505146baca00a1b3268d11d10510afa8cea6f1d
GitHub-Pull-Request: golang/go#49626
Reviewed-on: https://go-review.googlesource.com/c/go/+/364634
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>