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/busctl/busctl.c b/src/busctl/busctl.c
index 3b2b5f3fc2..44110b63f9 100644
--- a/src/busctl/busctl.c
+++ b/src/busctl/busctl.c
@@ -692,12 +692,7 @@ static void member_free(Member *m) {
 DEFINE_TRIVIAL_CLEANUP_FUNC(Member*, member_free);
 
 static void member_set_free(Set *s) {
-        Member *m;
-
-        while ((m = set_steal_first(s)))
-                member_free(m);
-
-        set_free(s);
+        set_free_with_destructor(s, member_free);
 }
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(Set*, member_set_free);