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/journalctl.c b/src/journal/journalctl.c
index d00a815ba9..47206d383a 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -1029,7 +1029,7 @@ static int get_possible_units(sd_journal *j,
         const char *field;
         int r;
 
-        found = set_new(string_hash_func, string_compare_func);
+        found = set_new(&string_hash_ops);
         if (!found)
                 return log_oom();