sppp: remove duplicate initialisation

[Klemens Nanni]

OK?

Index: net/if_spppsubr.c
===================================================================
RCS file: /cvs/src/sys/net/if_spppsubr.c,v
retrieving revision 1.174
diff -u -p -r1.174 if_spppsubr.c
--- net/if_spppsubr.c   19 Feb 2018 08:59:52 -0000      1.174
+++ net/if_spppsubr.c   22 Jun 2019 09:28:17 -0000
@@ -3566,7 +3562,6 @@ sppp_chap_tlu(struct sppp *sp)
        STDDCL;
        int i = 0, x;
 
-       i = 0;
        sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
 
        /*