aio: Take in account a ring never has a parent in pre-dump
aio: Take in account a ring never has a parent in pre-dump

Since AIO ring is never pre-dumped, it never has a parent
in pre-dump. Make generate_iovs() to know this.

Signed-off-by: Kirill Tkhai <e5b39230c99b4d3ebd6aa54f6d823f95134bc39d@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

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