resolve: use custom hash_ops for managing Link objects

src/resolve/resolved-link.c

@@ -34,6 +34,14 @@
 #include "strv.h"
 #include "tmpfile-util.h"
 
+DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
+        link_hash_ops,
+        void,
+        trivial_hash_func,
+        trivial_compare_func,
+        Link,
+        link_free);
+
 int link_new(Manager *m, Link **ret, int ifindex) {
         _cleanup_(link_freep) Link *l = NULL;
         int r;
@@ -58,7 +66,7 @@ int link_new(Manager *m, Link **ret, int ifindex) {
         if (asprintf(&l->state_file, "/run/systemd/resolve/netif/%i", ifindex) < 0)
                 return -ENOMEM;
 
-        r = hashmap_ensure_put(&m->links, NULL, INT_TO_PTR(ifindex), l);
+        r = hashmap_ensure_put(&m->links, &link_hash_ops, INT_TO_PTR(ifindex), l);
         if (r < 0)
                 return r;
 

src/resolve/resolved-manager.c

@@ -839,8 +839,6 @@ int manager_start(Manager *m) {
 }
 
 Manager* manager_free(Manager *m) {
-        Link *l;
-
         if (!m)
                 return NULL;
 
@@ -848,9 +846,7 @@ Manager* manager_free(Manager *m) {
         dns_server_unlink_all(m->fallback_dns_servers);
         dns_search_domain_unlink_all(m->search_domains);
 
-        while ((l = hashmap_first(m->links)))
-               link_free(l);
-
+        m->links = hashmap_free(m->links);
         m->delegates = hashmap_free(m->delegates);
 
         while (m->dns_queries)
@@ -869,7 +865,6 @@ Manager* manager_free(Manager *m) {
 #endif
 
         set_free(m->refuse_record_types);
-        hashmap_free(m->links);
         hashmap_free(m->dns_transactions);
 
         sd_event_source_unref(m->network_event_source);