qemu-img rebase: Fix for undersized backing files
Backing files may be smaller than the corresponding COW file. When reading directly from the backing file, qemu-img rebase must consider this and assume zero sectors after the end of backing files. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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