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/libsystemd/sd-bus/busctl.c b/src/libsystemd/sd-bus/busctl.c
index af71804410..f06b74505b 100644
--- a/src/libsystemd/sd-bus/busctl.c
+++ b/src/libsystemd/sd-bus/busctl.c
@@ -76,7 +76,7 @@ static int list_bus_names(sd_bus *bus, char **argv) {
 
         pager_open_if_enabled();
 
-        names = hashmap_new(string_hash_func, string_compare_func);
+        names = hashmap_new(&string_hash_ops);
         if (!names)
                 return log_oom();