vrank = (rank - root + size) % size;
- bmtree = (ompi_coll_tree_t*)malloc(sizeof(ompi_coll_tree_t));
+ bmtree = (ompi_coll_tree_t*)xbt_malloc(sizeof(ompi_coll_tree_t));
if (!bmtree) {
XBT_DEBUG("coll:tuned:topo:build_bmtree PANIC out of memory");
return NULL;