bytes, strings: fix Reader.UnreadRune returning without error on a zero Reader
Fixes #28269 Change-Id: I878dff43c0b6bdb98702d8e73f2ecd984fb2350f Reviewed-on: https://go-review.googlesource.com/c/145098Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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