Tables that have one element per protocol or address family were
previously sized by AF_MAX + 1 since AF_MAX was off by one. Now that
AF_MAX has been corrected, we need to apply the opposite correction to
these tables.
Fixes: ddd850aa7720 ("sys/socket.h: Fix AF_MAX")
MFC after: 3 days
Sponsored by: Klara, Inc.
Sponsored by: NetApp, Inc.