bufio: use max/min func
Change-Id: I52875f8dd4bbdc9296ba8e4f801356047ee14e62
GitHub-Last-Rev:
dfb2a343e60f0994a5741e1b4534e464a80ba2ef
GitHub-Pull-Request: golang/go#63344
Reviewed-on: https://go-review.googlesource.com/c/go/+/532216
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>