qcow2: Check new refcount table size on growth
If the size becomes larger than what qcow2_open() would accept, fail the growing operation. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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