block: Fail if requested driver is not available
If an explicit driver option is present, but doesn't specify a valid driver, then bdrv_open() should fail instead of probing the format. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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