BUG/MINOR: quic: Remove useless BUG_ON() in newreno and cubic algo implementation

As now_ms may be zero, these BUG_ON() could be triggered when its value has wrapped.
These call to BUG_ON() may be removed because the values they was supposed to
check are safely used by the ticks API.

Must be backported to 2.6 and 2.7.
2 files changed