Fix 2 issues: 1) MAPCAR doesn't take a :key argument, 2) use a stream-argument for LISTEN
Fix 2 issues:
1) MAPCAR doesn't take a :key argument,
2) use a stream-argument for LISTEN


Found by: binghe Chun Tian <binghe.lisp@gmail.com>


dkochmanski/usocket,tmccombs/usocket,lispnik/usocket