Merge branch 'en/hashmap-clear-fix'

hashmap API clean-up to ensure hashmap_clear() leaves a cleared map
in a reusable state.

* en/hashmap-clear-fix:
  hashmap: ensure hashmaps are reusable after hashmap_clear()

Author: gitster

hashmap.c

@@ -205,8 +205,9 @@ void hashmap_clear_(struct hashmap *map, ssize_t entry_offset)
 		return;
 	if (entry_offset >= 0)  /* called by hashmap_clear_and_free */
 		free_individual_entries(map, entry_offset);
-	free(map->table);
-	memset(map, 0, sizeof(*map));
+	FREE_AND_NULL(map->table);
+	map->tablesize = 0;
+	map->private_size = 0;
 }
 
 struct hashmap_entry *hashmap_get(const struct hashmap *map,