fix if_timer handling: - only set it to non-zero when at least on packet is enqueued - zero it if we tx'd at least one packet
fix if_timer handling:
- only set it to non-zero when at least on packet is enqueued
- zero it if we tx'd at least one packet

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