magic code in /src/sys/net/if_spppsubr.c

[f5b]

/src/sys/net/if_spppsubr.c 
rev=1.98

1. line 3557
p               opt[i++] = 0;   /* TBD */

2. see line  (begin with ^L)
466
1145
1276
1991
2675
4116
4430

compare to line  (insert empty line)
3150
3642