From 0fbd9806391ff4eeeadfbf4e88e6982905b3ff5a Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Sun, 21 May 2017 22:24:43 +0100
Subject: [PATCH] Fix compiler warning.

---
 src/edns0.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/edns0.c b/src/edns0.c
index c7a101e..d624225 100644
--- a/src/edns0.c
+++ b/src/edns0.c
@@ -304,7 +304,7 @@ static size_t calc_subnet_opt(struct subnet_opt *opt, union mysockaddr *source)
   /* http://tools.ietf.org/html/draft-vandergaast-edns-client-subnet-02 */
   
   int len;
-  void *addrp;
+  void *addrp = NULL;
   int sa_family = source->sa.sa_family;
 
   opt->source_netmask = 0;
@@ -344,7 +344,7 @@ static size_t calc_subnet_opt(struct subnet_opt *opt, union mysockaddr *source)
   
   len = 0;
   
-  if (opt->source_netmask != 0)
+  if (addrp && opt->source_netmask != 0)
     {
       len = ((opt->source_netmask - 1) >> 3) + 1;
       memcpy(opt->addr, addrp, len);