Unused since introduction in 1.17 from 2015.

OK?

Index: mroute6.c
===================================================================
RCS file: /cvs/src/usr.bin/netstat/mroute6.c,v
retrieving revision 1.23
diff -u -p -r1.23 mroute6.c
--- mroute6.c   8 May 2017 09:31:34 -0000       1.23
+++ mroute6.c   3 Jun 2018 14:09:13 -0000
@@ -92,7 +92,6 @@ mroute6pr(void)
        struct mif6info *mif;
        size_t needed, mifi, nummifs, mfci, nummfcs;
        int banner_printed, saved_nflag;
-       mifi_t maxmif = 0;
        u_int mrtproto;
        int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_MRTPROTO };
        size_t len = sizeof(int);
@@ -119,8 +118,6 @@ mroute6pr(void)
        needed = get_sysctl(mib, sizeof(mib) / sizeof(mib[0]), &buf);
        nummifs = needed / sizeof(*mif);
        mif = (struct mif6info *)buf;
-       if (nummifs)
-               maxmif = mif[nummifs - 1].m6_mifi;
 
        banner_printed = 0;
        for (mifi = 0; mifi < nummifs; ++mifi, ++mif) {

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