Fix KASSERT on pipex_ppp_input().  Must not reached there even if the tunneling protocol is PPPoE.
Fix KASSERT on pipex_ppp_input().  Must not reached there even if the
tunneling protocol is PPPoE.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars