fix a bug copied from libknot; GC seems to work now

diff --git a/lib/cache/cdb_compat.c b/lib/cache/cdb_compat.c
index b15f6710b6c8e0be3fd2f617e18cf82f4cc73e20..7718d5c75c9b95b82ca77711b8f856dd07e5fe07 100644 (file)
--- a/lib/cache/cdb_compat.c
+++ b/lib/cache/cdb_compat.c
@@ -258,9 +258,8 @@ static int del(knot_db_txn_t *txn, knot_db_val_t *key)
 {
        struct lmdb_env *env = txn->db;
        MDB_val db_key = val_knot2mdb(*key);
-       MDB_val data = { 0 };
 
-       int ret = mdb_del(txn->txn, env->dbi, &db_key, &data);
+       int ret = mdb_del(txn->txn, env->dbi, &db_key, NULL);
        if (ret != MDB_SUCCESS) {
                return lmdb_error_to_knot(ret);
        }