From b802d830b98abfc9b2d2fa21dd4480b2d4287a37 Mon Sep 17 00:00:00 2001
From: Patrick Pelissier <Patrick.Pelissier@gmail.com>
Date: Sat, 26 Aug 2017 09:09:30 +0200
Subject: [PATCH] Add assertion.

---
 m-buffer.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/m-buffer.h b/m-buffer.h
index 833020b3..5cc3c327 100644
--- a/m-buffer.h
+++ b/m-buffer.h
@@ -239,6 +239,7 @@ M_C(name, _init)(buffer_t v, size_t size)                               \
  M_C(name, _pop)(type *data, buffer_t v)				\
  {                                                                      \
    BUFFERI_CONTRACT(v,m_size);						\
+   assert (data != NULL);						\
 									\
    /* BUFFER lock */							\
    if (!BUFFERI_POLICY_P((policy), BUFFER_THREAD_UNSAFE)) {             \