Little bug: Timeout not working when no data on control connection

Hi,

tiny bug in lftp (tested with 3.0.6):

When lftp gets a connection on on the control connection, but no actual
data is received, it hangs at [FEAT negotiation...]. In this state,
timeouts are not working; even if net:timeout is set, it will hang.

This situation (connection, but no data) may seem unusual, but it does
happen. It occurs with sites that use a port bouncer (e.g. hpbnc) for
the control connection, if the bouncer is up, but the site itself is
down. 

bye,
Till