vl: Print -device help at most once
We print it once for each -device help. Not helpful. Stop after the first one. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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We print it once for each -device help. Not helpful. Stop after the first one. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>