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/journal/coredumpctl.c b/src/journal/coredumpctl.c
index 34dcae87c0..d4756fe67d 100644
--- a/src/journal/coredumpctl.c
+++ b/src/journal/coredumpctl.c
@@ -58,7 +58,7 @@ static Set *new_matches(void) {
         char *tmp;
         int r;
 
-        set = set_new(trivial_hash_func, trivial_compare_func);
+        set = set_new(NULL);
         if (!set) {
                 log_oom();
                 return NULL;