Patch supplied by Nick Bowler on https://bugs.gentoo.org/962770

This avoids a NULL dereference in case ntp fails to bind() to a decided upon
address that should be bound.
--- ntp-4.2.8p18/ntpd/ntp_io.c.orig
+++ ntp-4.2.8p18/ntpd/ntp_io.c
@@ -1921,11 +1921,11 @@
 		}
 		else {
 			DPRINT_INTERFACE(3,
-				(ep, "updating ", " new - FAILED"));
+				(ep2, "updating ", " new - FAILED"));
 
 			msyslog(LOG_ERR,
 				"cannot bind address %s",
-				stoa(&ep->sin));
+				stoa(&ep2->sin));
 		}
 		free(ep2);
 	}