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/transaction.c b/src/core/transaction.c
index 1f4c9ce416..dbb4133fe3 100644
--- a/src/core/transaction.c
+++ b/src/core/transaction.c
@@ -1143,7 +1143,7 @@ Transaction *transaction_new(bool irreversible) {
         if (!tr)
                 return NULL;
 
-        tr->jobs = hashmap_new(trivial_hash_func, trivial_compare_func);
+        tr->jobs = hashmap_new(NULL);
         if (!tr->jobs) {
                 free(tr);
                 return NULL;