qemu-error: make use of {error, warn}_report_once_cond
{error,warn}_report_once() are a special case of the new functions and can simply switch to them. Signed-off-by: NCornelia Huck <cohuck@redhat.com> Message-Id: <20180830145902.27376-3-cohuck@redhat.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> [Dispense with unlikely() to keep the macros as simple as possible] Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
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