This didn't break anything yet but QOM properties should be able to set
the value to something else without setting an intermediate zero string.
Reviewed-by: Eduardo Habhost <ehabkost@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
[AF: Use memset() instead of for loop, suggested by Igor] Signed-off-by: Andreas Färber <afaerber@suse.de>