Initialize all fields of sockaddr_in.
http://skarnet.org/cgi-bin/archive.cgi?2:mss:1163:201602:gpiglpbjdemlioaeabbn

--- runit-2.1.2/src/svlogd.c 2014-08-10 15:22:34.000000000 -0300
+++ runit-2.1.2/src/svlogd.c 2016-02-04 22:53:52.910965361 -0300
@@ -430,6 +430,7 @@
   ld->name =(char*)fn;
   ld->ppid =0;
   ld->match ='+';
+  ld->udpaddr.sin_family =AF_INET;
   ld->udpaddr.sin_port =0;
   ld->udponly =0;
   while (! stralloc_copys(&ld->prefix, "")) pause_nomem();