block: Fix early failure in multiwrite
bdrv_aio_writev may call the callback immediately (and it will commonly do so in error cases). Current code doesn't consider this. For details see the comment added by this patch. Signed-off-by: NKevin Wolf <kwolf@redhat.com> (cherry picked from commit 453f9a16) Conflicts: block.c Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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