the ipv4 ones return void, and these can't fail, so make them return
nothing too.

ok?

Index: netinet/in_pcb.h
===================================================================
RCS file: /cvs/src/sys/netinet/in_pcb.h,v
retrieving revision 1.116
diff -u -p -r1.116 in_pcb.h
--- netinet/in_pcb.h    15 Jul 2019 12:40:42 -0000      1.116
+++ netinet/in_pcb.h    16 Oct 2019 10:09:24 -0000
@@ -287,8 +287,8 @@ struct inpcb *
 int     in6_pcbaddrisavail(struct inpcb *, struct sockaddr_in6 *, int,
            struct proc *);
 int     in6_pcbconnect(struct inpcb *, struct mbuf *);
-int     in6_setsockaddr(struct inpcb *, struct mbuf *);
-int     in6_setpeeraddr(struct inpcb *, struct mbuf *);
+void    in6_setsockaddr(struct inpcb *, struct mbuf *);
+void    in6_setpeeraddr(struct inpcb *, struct mbuf *);
 #endif /* INET6 */
 void    in_pcbinit(struct inpcbtable *, int);
 struct inpcb *
Index: netinet6/in6_pcb.c
===================================================================
RCS file: /cvs/src/sys/netinet6/in6_pcb.c,v
retrieving revision 1.108
diff -u -p -r1.108 in6_pcb.c
--- netinet6/in6_pcb.c  4 Oct 2018 17:33:41 -0000       1.108
+++ netinet6/in6_pcb.c  16 Oct 2019 10:09:24 -0000
@@ -305,7 +305,7 @@ in6_pcbconnect(struct inpcb *inp, struct
  * Get the local address/port, and put it in a sockaddr_in6.
  * This services the getsockname(2) call.
  */
-int
+void
 in6_setsockaddr(struct inpcb *inp, struct mbuf *nam)
 {
        struct sockaddr_in6 *sin6;
@@ -320,15 +320,13 @@ in6_setsockaddr(struct inpcb *inp, struc
        sin6->sin6_addr = inp->inp_laddr6;
        /* KAME hack: recover scopeid */
        in6_recoverscope(sin6, &inp->inp_laddr6);
-
-       return 0;
 }
 
 /*
  * Get the foreign address/port, and put it in a sockaddr_in6.
  * This services the getpeername(2) call.
  */
-int
+void
 in6_setpeeraddr(struct inpcb *inp, struct mbuf *nam)
 {
        struct sockaddr_in6 *sin6;
@@ -343,8 +341,6 @@ in6_setpeeraddr(struct inpcb *inp, struc
        sin6->sin6_addr = inp->inp_faddr6;
        /* KAME hack: recover scopeid */
        in6_recoverscope(sin6, &inp->inp_faddr6);
-
-       return 0;
 }
 
 /*

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