From 64c75b64f46f8437f940ce74017641e509cf4c54 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Fri, 29 Nov 2019 22:44:00 +0100
Subject: document rval

---
 src/include/gnunet_common.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/include/gnunet_common.h b/src/include/gnunet_common.h
index f4f68a95f..3ac186e0b 100644
--- a/src/include/gnunet_common.h
+++ b/src/include/gnunet_common.h
@@ -1081,10 +1081,11 @@ GNUNET_ntoh_double (double d);
  *
  * @param a pointer to a struct which should be tested for the
  *          entire memory being zero'ed out.
+ * @return 0 if a is zero, non-zero otherwise
  */
 #define GNUNET_is_zero(a)           \
   ({                                \
-    static const typeof (*a)_z;    \
+    static const typeof (*a) _z;    \
     memcmp ((a), &_z, sizeof(_z)); \
   })
 
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