More CARP issues under 12

[Pete French]

> Hi,
>
> What branch and revision do you use? Can you install gdb and then obtain
> this information:

The branch and revision is 12.0-STABLE r343538 GENERIC

> # kgdb
>
> (kgdb) list *ether_output+0x6b6

trying to do this on the actual box is hard, as it panics, but on another
machine running the same build I get this, which should suffice if you
are just interested in seeing the line in the source code ?

(kgdb)  list *ether_output+0x6b6
0xffffffff80ca1526 is in ether_output (/usr/src/sys/net/if_ethersubr.c:435).
430                     if (m == NULL)
431                             return (0);
432             }
433
434             /* Continue with link-layer output */
435             return ether_output_frame(ifp, m);
436     }
437
438     static bool
439     ether_set_pcp(struct mbuf **mp, struct ifnet *ifp, uint8_t pcp)