block: Always pass NULL as drv for bdrv_open()
Change all callers of bdrv_open() to pass the driver name in the options QDict instead of passing its BlockDriver pointer. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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