Follow up on three occurences missed in CL 309689.
The raw fds are successively wrapped using os.NewFile and will be closed
by (*os.File).Close. Avoids a double close, in the worst case closing an
unrelated fd.
Change-Id: Iffe4cc4f77db10237547915c362c4aeb20cc9630
Reviewed-on: https://go-review.googlesource.com/c/sys/+/310010
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>