qcow2: Fix types in qcow2_alloc_clusters and alloc_clusters_noref
In order to avoid integer overflows. 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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