diff --git a/http-relay.c b/http-relay.c
index 1e3ae67..4d03fe7 100644
--- a/http-relay.c
+++ b/http-relay.c
@@ -450,7 +450,6 @@ static void httpr_client_read_content(struct bufferevent *buffev, redsocks_clien
 	static int post_buffer_len = 64 * 1024;
 	char *post_buffer = calloc(post_buffer_len, 1);
 	if (!post_buffer) {
-		free(post_buffer);
 		redsocks_log_error(client, LOG_ERR, "run out of memory");
 		redsocks_drop_client(client);
 		return;
diff --git a/redsocks.h b/redsocks.h
index 1a4a7c1..9d2ff3e 100644
--- a/redsocks.h
+++ b/redsocks.h
@@ -14,6 +14,7 @@
 
 
 struct redsocks_client_t;
+struct redsocks_instance_t;
 
 typedef struct relay_subsys_t {
 	char   *name;
@@ -23,7 +24,7 @@ typedef struct relay_subsys_t {
 	evbuffercb writecb;
 	void       (*init)(struct redsocks_client_t *client);
 	void       (*fini)(struct redsocks_client_t *client);
-	void       (*instance_fini)(struct redsocks_client_t *client);
+	void       (*instance_fini)(struct redsocks_instance_t *instance);
 	// connect_relay (if any) is called instead of redsocks_connect_relay after client connection acceptance
 	void       (*connect_relay)(struct redsocks_client_t *client);
 	// client_eof is called while relay is not set up but EOF from client is received