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LaunchQemu now connects a pipe to QEMU's stderr and makes it
usable by callers through a Go io.ReadCloser object. As
explained in [0], all messages should be read from the pipe
before calling cmd.Wait : introduce a LogAndWait helper to handle
that.
Fixes #5780
Signed-off-by: Greg Kurz <groug@kaod.org>
(cherry picked from commit 39fe4a4b6f)
Signed-off-by: Greg Kurz <groug@kaod.org>