vmdk: Allow reading variable size descriptor files
the hard-coded 2k buffer on the stack won't allow reading big descriptor files which can be generated when storing big images. For example 500G vmdk splitted to 2G chunks. Signed-off-by: NEvgeny Budilovsky <evgeny.budilovsky@ravellosystems.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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