$NetBSD: patch-am,v 1.1 2011/06/05 23:10:12 pettai Exp $

From http://seclists.org/nmap-dev/2011/q2/221

--- TargetGroup.cc.orig	2011-04-15 10:53:27.000000000 -0500
+++ TargetGroup.cc	2011-04-15 10:38:27.000000000 -0500
@@ -220,7 +220,8 @@
           resolvedaddrs.push_back(ss);
         }
       }
-      freeaddrinfo(addrs);
+      if (addrs)
+        freeaddrinfo(addrs);
 
       if (resolvedaddrs.empty()) {
         error("Failed to resolve given hostname/IP: %s.  Note that you can't use '/mask' AND '1-4,7,100-' style IP ranges", target_net);