Merge branch 'mh/clear-topo-walk-upon-reset'

The revision walking machinery uses resources like per-object flag bits that need to be reset before a new iteration of walking begins, but the resources related to topological walk were not cleared correctly, which has been corrected. * mh/clear-topo-walk-upon-reset: revision: free topo_walk_info before creating a new one in init_topo_walk revision: clear the topo-walk flags in reset_revision_walk