iotests: 055: Don't attach the target image already for drive-backup
Double attach is not a valid usage of the target image, drive-backup will open the blockdev itself so skip the add_drive call in this case. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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