[PATCH] syslet: fix leak of ring and ahu

Clean it in async_unregister()

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/syslet-rw.c b/engines/syslet-rw.c
index d6d9943..71a2c60 100644
--- a/engines/syslet-rw.c
+++ b/engines/syslet-rw.c
@@ -206,6 +206,9 @@
 {
 	if (async_unregister(sd->ahu, sizeof(*sd->ahu)) < 0)
 		perror("async_register");
+
+	free(sd->ahu);
+	free(sd->ring);
 }
 
 static void fio_syslet_cleanup(struct thread_data *td)