qemu: only report errno in trace message on failure
Avoid reporting a stale errno value when the syscall succeeds,
instead always pass 0.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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Avoid reporting a stale errno value when the syscall succeeds,
instead always pass 0.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>