encoding/asn1: simplify appendFourDigits
The new code does not need a for-loop and is easier to read.
Change-Id: Ic182d63c4779c2179b721fcfaec362681284cc16
GitHub-Last-Rev:
b3ee265df7eb4d51c945bf5453eb1b09f91912d9
GitHub-Pull-Request: golang/go#63879
Reviewed-on: https://go-review.googlesource.com/c/go/+/538721
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>