internal/zstd: allow stream consisting of skippable frames
For #62513
Change-Id: I2557aed5ae106ea4684bb599cce740e9da9df780
GitHub-Last-Rev:
2b7ddc6c09a7e77874ed9aefc47fbc445d2579ec
GitHub-Pull-Request: golang/go#63251
Reviewed-on: https://go-review.googlesource.com/c/go/+/531295
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>