In the NEXTADDR macro use SA_SIZE() rather than directly using

sizeof(), as introduced in r186119, for advancing the current
position into the buffer.
See comment in net/route.h for a description of the difference.
This makes ndp -s work again.

Reviewed by:	qingli
X-MFC after:	now

usr.sbin/ndp/ndp.c

@@ -116,7 +116,7 @@
 
 #define NEXTADDR(w, s) \
 	if (rtm->rtm_addrs & (w)) { \
-		bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
+		bcopy((char *)&s, cp, sizeof(s)); cp += SA_SIZE(&s);}
 
 
 static pid_t pid;