From f0d140c281f6a6f20398152515e0294aca5c30b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
Date: Tue, 10 Oct 2023 06:04:49 +0200
Subject: [PATCH] transaction: Properly handle nil bytes in binary transactions

If returned binaries are nil, we should pass them as nil and not as an
empty bytes array.
---
 transaction.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/transaction.go b/transaction.go
index 7f5b3e5..ae052c8 100644
--- a/transaction.go
+++ b/transaction.go
@@ -105,6 +105,9 @@ func cbPAMConv(s C.int, msg *C.char, c C.uintptr_t) (*C.char, C.int) {
 			if err != nil {
 				return nil, C.int(ErrConv)
 			}
+			if bytes == nil {
+				return nil, success
+			}
 			return (*C.char)(C.CBytes(bytes)), success
 		}
 		handler = cb