Add set/hashmap helpers for non-trivial freeing and use where straighforward

A macro is needed because otherwise we couldn't ensure type safety.
Some simple tests are included.
No functional change intended.

1 files changed, 1 insertions, 6 deletions

diff --git a/src/shared/bus-util.c b/src/shared/bus-util.c
index 0fb28c24d..81e1db34f 100644
--- a/src/shared/bus-util.c
+++ b/src/shared/bus-util.c
@@ -555,12 +555,7 @@ int bus_verify_polkit_async(
 
 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 #if ENABLE_POLKIT
-        AsyncPolkitQuery *q;
-
-        while ((q = hashmap_steal_first(registry)))
-                async_polkit_query_free(q);
-
-        hashmap_free(registry);
+        hashmap_free_with_destructor(registry, async_polkit_query_free);
 #endif
 }