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block: Use blk_make_empty() after commits
bdrv_commit() already has a BlockBackend pointing to the BDS that we want to empty, it just has the wrong permissions. qemu-img commit has no BlockBackend pointing to the old backing file yet, but introducing one is simple. After this commit, bdrv_make_empty() is the only remaining caller of BlockDriver.bdrv_make_empty(). Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200429141126.85159-5-mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [kwolf: Fixed up reference output for 098] Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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