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/readahead/readahead-collect.c b/src/readahead/readahead-collect.c
index 1592cc8678..822a803a41 100644
--- a/src/readahead/readahead-collect.c
+++ b/src/readahead/readahead-collect.c
@@ -282,7 +282,7 @@ static int collect(const char *root) {
                 goto finish;
         }
 
-        files = hashmap_new(string_hash_func, string_compare_func);
+        files = hashmap_new(&string_hash_ops);
         if (!files) {
                 log_error("Failed to allocate set.");
                 r = -ENOMEM;