io: simplified a small part of copyBuffer
Change-Id: I0b7052103174f0864ee9714f76f8f78f2a988777 Reviewed-on: https://go-review.googlesource.com/30719Reviewed-by:Joe Tsai <thebrokentoaster@gmail.com> Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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