hash: fix RCU configuration memory leak

The memory of h->hash_rcu_cfg which is allocated in
rte_hash_rcu_qsbr_add was leaked.

Fixes: 769b2de7fb ("hash: implement RCU resources reclamation")
Cc: stable@dpdk.org

Signed-off-by: Jun Qiu <jun.qiu@jaguarmicro.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

lib/hash/rte_cuckoo_hash.c

@@ -521,6 +521,7 @@ rte_hash_free(struct rte_hash *h)
 	rte_free(h->buckets_ext);
 	rte_free(h->tbl_chng_cnt);
 	rte_free(h->ext_bkt_to_free);
+	rte_free(h->hash_rcu_cfg);
 	rte_free(h);
 	rte_free(te);
 }