hashmap: introduce hash_ops to make struct Hashmap smaller

It is redundant to store 'hash' and 'compare' function pointers in
struct Hashmap separately. The functions always comprise a pair.
Store a single pointer to struct hash_ops instead.

systemd keeps hundreds of hashmaps, so this saves a little bit of
memory.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/dbus.c b/src/core/dbus.c
index e7eee3c6d1..09b4a4ac6f 100644
--- a/src/core/dbus.c
+++ b/src/core/dbus.c
@@ -659,7 +659,7 @@ static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void
                 return 0;
         }
 
-        r = set_ensure_allocated(&m->private_buses, trivial_hash_func, trivial_compare_func);
+        r = set_ensure_allocated(&m->private_buses, NULL);
         if (r < 0) {
                 log_oom();
                 return 0;