Variables starting with `l' in kern

• listeners kern/mach_net.c:292
• listener_zone kern/mach_net.c:306
• lock_data kern/lock.h:75
• lock_wait_time kern/lock.c:132
• lookupd_port kern/ipc_xxx.c:111
• lookupd_port_priv kern/ipc_xxx.c:111