memattrs: remove MemoryTier info when not valid anymore

When recomputing memory tiers, remove all existing ones
instead of just replacing some.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc/memattrs.c

@@ -1801,7 +1801,7 @@ hwloc__apply_memory_tiers_subtypes(hwloc_topology_t topology,
         if (nr_tiers > 1) {
           char tmp[20];
           snprintf(tmp, sizeof(tmp), "%u", j);
-          hwloc__replace_infos(&node->infos, "MemoryTier", tmp);
+          hwloc__add_info(&node->infos, "MemoryTier", tmp);
         }
         break; /* each node is in a single tier */
       }
@@ -1813,10 +1813,16 @@ int
 hwloc_internal_memattrs_guess_memory_tiers(hwloc_topology_t topology, int force_subtype)
 {
   struct hwloc_memory_tier_s *tiers;
+  hwloc_obj_t node = NULL;
   unsigned nr_tiers;
   unsigned i;
   const char *env;
 
+  /* removing existing info attrs */
+  while ((node = hwloc_get_next_obj_by_type(topology, HWLOC_OBJ_NUMANODE, node)) != NULL) {
+    hwloc__remove_infos(&node->infos, "MemoryTier", NULL);
+  }
+
   env = getenv("HWLOC_MEMTIERS");
   if (env) {
     if (!strcmp(env, "none"))