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H A Dblock.cdiff 5696c6e350be4d7b45b68e8460da1049bc9efe0a Fri Feb 17 11:39:24 CST 2017 Kevin Wolf <kwolf@redhat.com> 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: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>