block: Use BlockBackend for image probing
This fixes the use of a parent-less BdrvChild in bdrv_open_inherit() by converting it into a BlockBackend. Which is exactly what it should be, image probing is an external, standalone user of a node. The requests can't be considered to originate from the format driver node because that one isn't even opened yet. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
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