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/coredump-vacuum.c b/src/journal/coredump-vacuum.c
index 125bb3a4b8..fec901e8e4 100644
--- a/src/journal/coredump-vacuum.c
+++ b/src/journal/coredump-vacuum.c
@@ -194,7 +194,7 @@ int coredump_vacuum(int exclude_fd, off_t keep_free, off_t max_use) {
                             exclude_st.st_ino == st.st_ino)
                                 continue;
 
-                        r = hashmap_ensure_allocated(&h, NULL, NULL);
+                        r = hashmap_ensure_allocated(&h, NULL);
                         if (r < 0)
                                 return log_oom();