vmdk: Read footer for streamOptimized images
The footer takes precedence over the header when it exists. It contains the real grain directory offset that is missing in the header. Without this patch, streamOptimized images with a footer cannot be read. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: NJeff Cody <jcody@redhat.com>
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