syscall: use correct file descriptor in dup2 fallback path
This fixes a mistake in CL 220422. This changes code that is only executed on Linux kernel versions earlier than 2.6.27. Change-Id: I01280184f4d7b75e06387c38f1891e8f0a81f793 Reviewed-on: https://go-review.googlesource.com/c/go/+/244630 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Tobias Klauser <tobias.klauser@gmail.com>
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