from plugins/count_unrecognized_commands kicks in.
Several buffered lines are read and processed by
Danga::Client::process_read_buf() without checking if the socket was
closed. The attached patch seems to fix it.
-- Brian Grossman
git-svn-id: https://svn.perl.org/qpsmtpd/trunk@571 958fd67b-6ff1-0310-b445-bb7760255be9