BUG/MINOR: listener: close before free in `listener_accept`

safer to close handle before the object is put back in the global pool.

this was introduced by commit 9378bbe0bef4005155d ("MEDIUM: listener:
use protocol->accept_conn() to accept a connection")

this should fix github issue #902

no backport needed.

Signed-off-by: William Dauchy <wdauchy@gmail.com>
1 file changed