Add zone index argument.

--- sys/netinet/in_pcb.c	(svn+ssh://svn.freebsd.org/base/head)	(revision 261548)
+++ sys/netinet/in_pcb.c	(working copy)
@@ -449,7 +449,8 @@ in_pcb_lport(struct inpcb *inp, struct in_addr *la
 #ifdef INET6
 		if ((inp->inp_vflag & INP_IPV6) != 0)
 			tmpinp = in6_pcblookup_local(pcbinfo,
-			    &inp->in6p_laddr, lport, lookupflags, cred);
+			    &inp->in6p_laddr, inp->in6p_zoneid, lport,
+			    lookupflags, cred);
 #endif
 #if defined(INET) && defined(INET6)
 		else