qcow2: Do not return new value after refcount update
qcow2_update_cluster_refcount() does not have any quick access to the new refcount value, it has to call qcow2_get_refcount(). Some callers do not need that new value at all, others call qcow2_get_refcount() themselves anyway (albeit in a different code path, which can however be easily changed), therefore there is no advantage in making qcow2_update_cluster_refcount() return the new value. Drop it. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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